let rows = ["FBBBBBBRRL",
"BBFFFBBLRL",
"FBFFBFFLRL",
"FFBBBFBLRR",
"FFBFBFFLLL",
"BFBBBBFLLL",
"FFBFFFFLLR",
"FBBFBFBLRR",
"BBBFFFFRRR",
"BFBFFFBLLR",
"BFFBBFBLLL",
"FBBFFBFLRL",
"FBBBFBFRLR",
"BFBBBBBRRL",
"BBFFBBFLLR",
"FFBBBFBRRL",
"FFBBFFBLLL",
"BFFFFBFLLR",
"FBBFBBBLRR",
"FBBBFFFRRR",
"BFBFFFFLRL",
"BBFFFBBLRR",
"FBFBBFBLRR",
"FBBBBBFLLR",
"FFBBBFBRRR",
"BBBFFBBLLL",
"FFFBBBBLLR",
"FBBFBBFLLL",
"FBFFBFFRLL",
"BFBBFBFLLL",
"FFBBBBFRLR",
"BFBBFFBLLL",
"FFBFFBFLLR",
"BFBBBBFRLL",
"BBBBFFFRLR",
"FBFFFBBRRR",
"BBBFFBFRLR",
"BBFBFBFLRL",
"FBBBBBBRLR",
"FBBFFFBRRL",
"BBFBFBBLLL",
"BBFBFBFLLL",
"BBFBBBBRRL",
"BBBFFBFRRL",
"FBFBBBBLLR",
"BFFBFFFLLR",
"FBBBBFFRRR",
"BBFBFBFRLR",
"BFFFBBFLLR",
"BFBFFBFRLL",
"FFBFFFBRLL",
"BFFFFFBLRL",
"BFBFBFBLLR",
"BBFBBBBLLR",
"BFFBFBBRRL",
"FBFBBFBRRR",
"FBBBFBFRRR",
"FBFFFBBLLL",
"FBBFFFFLRL",
"FFBFFBBLLL",
"BFBBBFBRLL",
"BBBBFBFRRL",
"FFBBFFBRRR",
"FFFBBBFRRR",
"FFBBFBFRRR",
"BBFBBBFRLR",
"BBBFFFBRRL",
"FBBFBBFRRL",
"BFFBFFFRRR",
"BBFFBFBRRL",
"BFBBBFBLRL",
"FFFBBBBRLL",
"FFBFFFFRLR",
"BBFBFBFLLR",
"FBBBFBFLLR",
"BFFBBFFRRL",
"BFFFBFBLLR",
"FFBFFBFRLL",
"FFBBBBFLLL",
"FFFBBFFRRR",
"FBFFBBBLRR",
"FFFBBBBRLR",
"FBFBBBBRRL",
"FBFBBFBRLR",
"BBFFBBFLRR",
"BBBFFFBLRR",
"BBFBFFBLRL",
"FBFBFBBRLL",
"BFBFBBFRRR",
"BBFFBFFLLR",
"FBFFFBBLRL",
"FBFFFBBRLR",
"FBFFBFBLLR",
"FBBFFFFRLR",
"FBFBFFBRRL",
"BBFBFFBRLR",
"FBBBBBFRRR",
"FBFBFBFLLL",
"BFBFFFBRLR",
"FFFBBBBLLL",
"FFBFFFFLRL",
"BFFFFBFRRR",
"BBBFFFFLLR",
"BFBFBBFRLL",
"FFBBBBFRRL",
"BFBBBFFRLL",
"FBFFFFBRRR",
"FBFFBBFRRR",
"BBFBFFFLLR",
"FFBFFBBRLL",
"FBBFBFFRLL",
"FFBBFFBLRR",
"FBBFBFFRRL",
"FBFFFFFLRL",
"BBBFBFBRLR",
"FBBBBFBLLL",
"BFFFFBBRLL",
"FBBFBFBRLL",
"BBBFBFFRRL",
"BBBFFFBLLL",
"FBBBBBBRLL",
"FBFBBBBLLL",
"BBBFFFBRLR",
"BFFFBBFRLL",
"BFFBFFBLRL",
"BFBBBBBLLR",
"FBBFFBBRRR",
"FBBFFFFLLR",
"BFBBFFFRLR",
"FBFFFBBLRR",
"BBFBBFFRLR",
"BFFFFBFLRL",
"FFBBBFFRRR",
"FBFFFFFRLL",
"BBFFBFFRLR",
"FFBBBBBRRR",
"FFBBBBFRLL",
"FBFFFFFLRR",
"FFBFFBFLRR",
"BBFBBFFRRR",
"BFBFBBBRRL",
"FBBFBFFLRL",
"FBBFFBBLLR",
"BFFFFBBLLL",
"BBFBBBBLRR",
"BFBBFBFRRL",
"BFBBFFFLRL",
"FFBBFFBLRL",
"BBFFBBFLLL",
"BBBFBBBRLL",
"BBFBFBBLRR",
"BFFBFBBRLR",
"FBFFBFBRLL",
"FBFBBFFRLL",
"BBFBBBBLRL",
"BBFBFFBLLR",
"FBBFFBFRRL",
"FFBBFBFRRL",
"BFFBBBBRRR",
"BFFBBFFLRR",
"BFFFFBFLLL",
"FBFBBFFLRL",
"FBFBFFFLRL",
"FFBBFFFLRL",
"FBBFBFFLRR",
"BBFFFFBLLL",
"BFBBBFFLLL",
"BFFBBBBLLR",
"BBBFBFFRLL",
"BBFFFBFRLR",
"FFBBFFFRLR",
"FFFBBFBRLR",
"BFBFBFFRRR",
"BBFFFBBRLR",
"BBBFFBBRRR",
"FFBFFBFRRR",
"BFBBBBBLRR",
"FBBFBFBRRR",
"BBFFFFFLLR",
"FFBFBBBLRR",
"BBFFFFFRRR",
"FBFBBFFLLR",
"BFBFFBFLLR",
"FFBFBFBRLL",
"BBBFFBBRLR",
"FBBBBBFRLL",
"FBFBBBFLLL",
"BBBBFBBLRR",
"BBBBFFBLRL",
"BFBFBFBLLL",
"BBFFBBBRLL",
"BFBBFFFRLL",
"BBBBFBFLRL",
"FFBFBBFLLR",
"BFBFFBFRRR",
"BBFFFBFLLL",
"FFBFBBBRRL",
"FBFBFFFLLR",
"FFBFBBFLRL",
"BFFFBFFRLL",
"FBFBFBFRLL",
"FBBBFFBLLR",
"FFBBBFFLRR",
"BFFFFFFLRL",
"FFBFBFFRLL",
"BBBFBBFRRR",
"FFBBFFBRLR",
"BBFBBFBRLL",
"FBBFBBBRLR",
"FBFBFFBLRL",
"FBBBFFFRRL",
"BBBFBFFLRR",
"FBFBBFBRRL",
"BFBFBBFRLR",
"BFFFFBBLLR",
"BBBFBBBLRR",
"FFBBBFFRRL",
"FBFBFBBRRL",
"FFFBBBFLLR",
"BFFFFFFRRR",
"FBFBFBBLRR",
"BFFFBFFRRL",
"FBBFBBFRRR",
"FBFBFFBLRR",
"FBBBBFBLLR",
"BBBBFBBLRL",
"BFFFBBFLRL",
"BFBBBFBRRL",
"BFBFBFBLRR",
"FBBBBBBRRR",
"FFBFBBBRLR",
"FBFFFBBRRL",
"BFFFFBFLRR",
"BBFBFFFRRR",
"FFBBFFFLRR",
"BFBBBBFRRR",
"FBFBFBFRRL",
"BBFFFBFRRR",
"BBBBFFBLLL",
"BFFBBFBLLR",
"FBFFFFBRRL",
"FBBBFBFLRR",
"FBBFFBFRLR",
"FFBBBBFLRR",
"BBFFFBBLLR",
"FFBFBFFLLR",
"BFFBFFBLLL",
"BFFFBBFRLR",
"BBFFFFBRRL",
"BBFBFBFRLL",
"FBFFFBFLRL",
"BBFFBBBLRR",
"BFBFBBFRRL",
"BBBFFBFLRR",
"BFFFBFBRLL",
"BBBFBBBLRL",
"BBFBBFFLLR",
"BFBBBBFRRL",
"FBBFFFBRLL",
"BBBFBFFLRL",
"BFBFFFBLRR",
"BBBFBBFRLR",
"BFBFBBBRLL",
"FBBFBFFLLL",
"FFBFBBFLRR",
"BFBBFFFLRR",
"BFFBBBFRRL",
"FFFBBFBLRL",
"FBFFBBFLRL",
"FBFFFBFLLL",
"FFBBBBBLRL",
"FFFBBFFRLL",
"BBFFBBBRRR",
"BFBBFBBLRR",
"BFBBBFFRRR",
"BFBFFBFLLL",
"BBBFFBFLRL",
"BBFFFFBLRL",
"FBFBBBFLRR",
"FBFFBBBLLL",
"FBBBBFFRRL",
"BBBFFBFLLR",
"BFFBFBFRRL",
"BFFFBFFRRR",
"BFBFBFBLRL",
"BFBFBFFLLL",
"FBFFBFBRRR",
"BFFBFFBRLL",
"BBBFBBBRRR",
"FBFBFFBRRR",
"FBFFFFFLLR",
"FFBFBFFRRL",
"BBFBBBFLLR",
"FBFFBBBLRL",
"BBFFFFBLRR",
"FFFBBBBRRL",
"FBFBFBBRLR",
"FFBBBBFLLR",
"FBFBBFBLRL",
"FBFFBFFRRL",
"FBBBFBBLLR",
"FBFBBFFRRR",
"BFBFBBBRLR",
"BBFBBBBRRR",
"FBFBBBFRRL",
"BBFBBBBRLR",
"FBFFBFFLLL",
"FBBBFFBRLR",
"FBFFFBFLRR",
"BBFBFFFLRR",
"FBFFFFBLRR",
"FBFFBBFRLR",
"FFFBBBFLLL",
"BFFFBFBLRL",
"FFBFFFFRRL",
"BBFFBFBRLL",
"BBFBBFFLRL",
"BBBBFFFLRR",
"FBBBBBBLRL",
"BFBFBFBRRL",
"BBBFFBBRRL",
"FBBFBBBLLL",
"FFBBFFFRLL",
"FBFFFFFLLL",
"FBBFBBFRLR",
"FBFFBFFRRR",
"BBFFFBBRLL",
"FFFBBFFLLR",
"BFFBFFBLRR",
"BFBBBBBLRL",
"FBBBFBFRRL",
"BFFFFFFLRR",
"FBFBFBBLRL",
"BFBFFFBLRL",
"FBBFFFBLRR",
"BFFBFBFLRR",
"FFBFBFBLLL",
"BFBFFBFLRL",
"FBBBFFBRLL",
"FFBBBFBLLL",
"FBFFFFFRLR",
"BBBFFFFRRL",
"FBFFBFFLRR",
"BFBFFBBLLR",
"BFBFFBFLRR",
"BBBBFBFRRR",
"FBFBBBFRRR",
"FBFFBBBRLR",
"BBFBFBBLLR",
"FBFBBBBLRR",
"BBBFBFBLLL",
"BFFFBBBLLR",
"BFFFBFFLLL",
"BFFFFFBLLL",
"FBFFBBBLLR",
"FBBFFBFRRR",
"FBFBFFBRLR",
"BBBFFFFLRR",
"FFBFFBBLRL",
"FBBFBBBLRL",
"FBFFFFFRRR",
"FFBBBFBRLR",
"BFBFFFFRRL",
"FFBFBFBLLR",
"BBFFFBFLLR",
"BBFFBBFRRL",
"BFBFBFBRRR",
"BFBFBFFLRR",
"BFFFFFBLLR",
"FBBBBBFLRL",
"FBBBFFBLRR",
"BBFFBBFLRL",
"BFBFBFFRLR",
"BFBFBBFLLR",
"BFFFBBBRLR",
"BFBBFBFRLL",
"BFFBBBBLRL",
"BBBFBBBRLR",
"BFFFBFFLRR",
"FFBBBBBRLR",
"BBFBFBBRRL",
"BFBBBFBLLL",
"FBFBBFFRLR",
"FFBFBFFRLR",
"FFBBFBBRLL",
"FBFFBBFLLR",
"BBBBFBFLRR",
"FFFBBFBLLL",
"BFFFBBFLLL",
"FFBFFFFRLL",
"FBBFBFBLRL",
"FFBBFBFLLR",
"BFBFBFBRLL",
"BFFBFBFRRR",
"BBFBFBFRRL",
"FFBFBFFRRR",
"BBBFFBBLRL",
"FBFFBFBLRL",
"BBFFBFFLRL",
"FBFFBFBLLL",
"BFFFBBBLRL",
"BFBFBFFLRL",
"FBBBBFFLLR",
"BBFFBBFRLL",
"BBFFBFBRLR",
"BFBBFFBLRR",
"BBFBBFBRRL",
"FBFFBBBRRL",
"FFBFBBBLLL",
"FFBFBFFLRR",
"BBBBFFBLLR",
"BBFFBBBLLL",
"BBFBBFFLRR",
"FBBBFBFLLL",
"FFFBBBBLRR",
"FFBBFBFLLL",
"BBFBBFBLRL",
"BFFBFBFLRL",
"BFFFBBBLRR",
"FBFBFBBRRR",
"FBBBFFFRLL",
"FBBBBBBLLL",
"BFFBFBBLLL",
"BBFFFBFRRL",
"FBBFBBBLLR",
"BFFBBBFLRR",
"FFFBBFBLLR",
"FBFFFBFRRL",
"BFBFBBBRRR",
"FBFBFFFRLL",
"BFFFBFBLRR",
"FBBBFBBLLL",
"BBBFBFFRLR",
"BFBBBFFLRR",
"BFFBBBFLLR",
"BBBBFFFRRL",
"BBFBBFFRRL",
"BFBBFBBRRL",
"FBBBBBFRRL",
"BFFBFBBRLL",
"FFBFFFBLLL",
"FFFBBBFLRR",
"FFBBBFBRLL",
"FBBFFBBRRL",
"BFFFBFBRRL",
"BFBBFBBLLL",
"BFFFFFFRRL",
"FFBFFFBRRR",
"BFFBFBFRLL",
"FBBFBBFLRR",
"BBFFFFBRRR",
"BFBFFFFLLL",
"FBBFFFBLLR",
"BBFFBFBLLL",
"BBFBFFBRLL",
"BBFBFFFLRL",
"FBBBFFFLLL",
"FFBFFBFRLR",
"FBFBFFFLLL",
"FBBBFBBLRL",
"FFBFBBFRLL",
"BFBFFFFRRR",
"FBFFFFBLLR",
"BFBBFBBLLR",
"FBFFBBFLRR",
"FBFBFFFRRL",
"BFBFFBFRLR",
"BBBBFFFLLR",
"BFBBBFFRRL",
"FBFBFFBRLL",
"FBBBBFBLRR",
"BBFFFFFRRL",
"BFFFFFFLLR",
"FBFFBBFLLL",
"BBFBBBFRRL",
"FBFFFFBRLR",
"FFBBBBBLLR",
"BBBBFBBLLR",
"BBFBFBBRLL",
"FBFFFBFRRR",
"FBBFBFBLLL",
"FBBFFFFLRR",
"FFFBBFFLRL",
"FBBBBFFRLR",
"FFBBBFFLRL",
"FBBBBBFLRR",
"FBBBBBFLLL",
"BFFFBFBLLL",
"BFBBBBBRLL",
"FBBBFBBRRR",
"FBFFBBFRRL",
"BFFBFFBRLR",
"BBFBBFBRRR",
"BBFFFBFLRL",
"FFBFFFBRLR",
"BFBFFFFRLR",
"FBBBBFFLRR",
"BFBFFBFRRL",
"BFFFFBBRLR",
"BFFBBBFRLL",
"BBFFFFFLLL",
"FBBFFFBRRR",
"BFBFBBFLRR",
"BFFBFBBLLR",
"BFFFBBFLRR",
"FFBBFFFLLR",
"FBFFFFFRRL",
"FBBBFFBLRL",
"FBFBBFBRLL",
"BFBBFBFLLR",
"BBBBFBFLLL",
"FBBFFFBRLR",
"BFFBFFFLRL",
"BBBFBFBRLL",
"FBBBBFBRRR",
"BBBFBBFLRR",
"BBFFBFFRRL",
"FBFBFBFRRR",
"BFBBBFFRLR",
"BBBFBBBLLR",
"FBFBBBBRRR",
"BFFBBBFLRL",
"FFBFFFFLLL",
"FBFFBFBRRL",
"FBFFFFBLLL",
"BFFFFFBRRR",
"BBBFFBFRRR",
"BFFFFFFRLL",
"BFBFFBBRRL",
"FBBBBBFRLR",
"BBFFBBBRLR",
"FFBFFBBLLR",
"BBFFBBBLRL",
"BBBFFBFLLL",
"BBBBFFBRRR",
"BBBFBBFLLL",
"FBFFFBFRLR",
"FBBFBBFRLL",
"FFBBBFFLLL",
"FFBBBBFLRL",
"FFBBBBFRRR",
"FFBBFBBLRL",
"FBFBBBFLLR",
"BFFFBBFRRL",
"BBBFBBFRLL",
"BFBBFFBRLL",
"BBFBBBFLLL",
"FFBBBBBLRR",
"BFFFFBBRRR",
"BBFFFFFRLL",
"FBBBFBBRLR",
"FFBFBBBLLR",
"BFFFFFFLLL",
"FBBFBBBRRR",
"FBFBFBFLRL",
"BFBFFFFLLR",
"BFFFFFBLRR",
"FBFBFFFRLR",
"BBBBFBFLLR",
"BBBBFFBRLR",
"BFFFFBFRLL",
"BFBFBBFLLL",
"FFBBBFFRLL",
"FFBBBBBRLL",
"BFBBFBFLRL",
"FFBBFBBLRR",
"BFBBBFBRLR",
"BBFFBFBRRR",
"BFFFBFFRLR",
"FFBFBFBRRR",
"BBFFFBFRLL",
"BFBBFFBRRR",
"FBFBBFFLLL",
"FBBFFBFLLR",
"BBFBBBFLRR",
"BFFBFFFRLR",
"BFFBFFBLLR",
"BFFBBFBRRL",
"BBBFFBBLRR",
"BFFFBFBRRR",
"FBFFFFBLRL",
"BBFFFFFLRR",
"FFBFFBBRLR",
"BBFBFBFRRR",
"BFBBFBBLRL",
"BFFBFFBRRL",
"FFBFFBBLRR",
"BFBBFFFRRR",
"BFBBBFFLLR",
"BBFBFFBRRR",
"BBBFBFBLRR",
"FFBFFFBLRR",
"BFFBBBBRLR",
"BFBFFBBLLL",
"BFBFBBBLLL",
"BBBFBFBLRL",
"FBBFBFBRRL",
"FBBBFFFLLR",
"BFFFFBFRRL",
"BFBBFBFLRR",
"BBFBFFBLLL",
"BBFBFFFRLL",
"BBBFFFFLRL",
"BFFBBBBLLL",
"FBFBBFFRRL",
"FBFFBFFRLR",
"BBBBFFFLRL",
"BFBFBFBRLR",
"BFBBBBFLLR",
"BBFFFFFLRL",
"BBBBFFFRLL",
"FFFBBBFRRL",
"FFBFFBFLRL",
"BBFBFFBRRL",
"BFFFFBFRLR",
"BFBBBBBRRR",
"BFFFBBBRRL",
"BBFBFFFLLL",
"FFBBFBFLRR",
"BFFBFBBRRR",
"FFBFFBFRRL",
"FBFFBFBLRR",
"FFBFFFBLLR",
"BFBFBBBLRR",
"BFFFFFBRLL",
"FBBFFBBLLL",
"BFFBBBFRRR",
"FBFBBBBLRL",
"BFBBBBFRLR",
"FBFFBBFRLL",
"BFBBBFBLRR",
"FBBFBFFRRR",
"FBBFFBFRLL",
"FFBFBBFRLR",
"BBBFFBBRLL",
"BBFFBFBLLR",
"BFBBFBFRRR",
"FBBFBBBRLL",
"FBBFFFFLLL",
"BFFBBFBRLR",
"FBBFBBBRRL",
"FBBFFFBLLL",
"BBFBBFFRLL",
"BBBBFBFRLL",
"BFFFFFBRRL",
"FBBBFBFRLL",
"BFFBBFFRLL",
"BBFFFFFRLR",
"FFBFBFFLRL",
"BFBBFBBRLL",
"FBBBFFBRRL",
"FFBFBBFLLL",
"BFBFFFFRLL",
"BBBFBBFLLR",
"BFBBFFBRLR",
"BBFFBFFLRR",
"FFBFBBFRRR",
"BBBFBFFLLL",
"FBBFFFFRRL",
"FFFBBFFLLL",
"FBBBFBBLRR",
"BFBFBBBLLR",
"FBFBBBFLRL",
"FFBBBFFLLR",
"BFBFBFFRLL",
"BFBBFFFRRL",
"BBBBFBFRLR",
"BFFBFFFRLL",
"FBFBBBBRLL",
"BBFBFFFRLR",
"FBBFBFFLLR",
"BFBBFFFLLR",
"BBFBBFFLLL",
"BFFBBFBRRR",
"FBBBFBFLRL",
"FFBBBFFRLR",
"BFBBBBBRLR",
"BBFBBFBLRR",
"FFBFFFFRRR",
"BFBFBFFRRL",
"FFBFBBBLRL",
"BBBFFFFRLR",
"FBBBFFBRRR",
"BFBFBBFLRL",
"BFBBBFBRRR",
"BFFBBFFRLR",
"FFBFFBBRRR",
"BBFFBFFRLL",
"BFBFFBBLRR",
"BBFBBBBLLL",
"BBFFBBFRLR",
"BFFBFFFRRL",
"BFBBFBBRLR",
"BBBBFFBLRR",
"FBFBFFFLRR",
"BFFFFBBLRR",
"BBBFFFBLRL",
"BBBFBBBRRL",
"FFBBFBFRLR",
"BBFBBFBRLR",
"BFFFBBBLLL",
"BFFBBBFRLR",
"BFBBBBBLLL",
"FBBFBFFRLR",
"BFFFFFBRLR",
"BBFBBFBLLL",
"BBFFBBBRRL",
"FFBFBFBLRR",
"BBFBFBBLRL",
"FBBBBFBLRL",
"BBFFFBBRRL",
"FBBBBFBRLR",
"FFBBBBBLLL",
"FBFBBFBLLR",
"BBFFBBFRRR",
"BFFFBBBRLL",
"BFBBFBBRRR",
"BBFBFBFLRR",
"FFBFBFBRRL",
"FFBBBFBLRL",
"BFFFBBBRRR",
"BFFBBFFRRR",
"FBBFFBBRLL",
"FBBFFBBRLR",
"FBBFFBFLRR",
"BBBBFFFRRR",
"BFFFFFFRLR",
"FBBBFFFRLR",
"BBBFBFBLLR",
"BFFBBFFLRL",
"FBFBBBFRLL",
"BFBFBBBLRL",
"BFBFFFBRRL",
"FBBBFFFLRR",
"BBFFBFFRRR",
"BBFBBBFLRL",
"FBBFBBFLRL",
"FBFBFBBLLL",
"FFBBFBFRLL",
"FBFFFBFRLL",
"BBFBFFBLRR",
"BFBBBFBLLR",
"FBFBFBFRLR",
"BFFFFBBLRL",
"FFBFFFFLRR",
"FBBFFFBLRL",
"BFFFBFBRLR",
"BBBBFFFLLL",
"BBFBBFBLLR",
"FFBBFBBLLL",
"FFBBFFFRRL",
"FFBFBFBRLR",
"BFFBBBFLLL",
"BBBFFFBLLR",
"BFFBFFBRRR",
"FFFBBFBRRR",
"FFFBBFFRRL",
"BBFBFFFRRL",
"FBBFBFBRLR",
"FBFBBFFLRR",
"BBFFBBBLLR",
"FFFBBFBRLL",
"FBBFFBBLRR",
"FFFBBBFRLL",
"FFBBFFFRRR",
"FBFBFBFLRR",
"FBFFFBBLLR",
"FBFFFFBRLL",
"BBFBBBFRRR",
"BFFBBBBRLL",
"FBFFFBBRLL",
"FFBBBBBRRL",
"FFBBFBBRLR",
"BFFBFBFLLL",
"FFBBBFBLLR",
"BFFBFBBLRL",
"FBBFFFFRRR",
"FBBBFBBRRL",
"FBFFBFFLLR",
"FFBBFFBRRL",
"BBFBBBFRLL",
"FFBFFFBRRL",
"BBFBFBBRLR",
"FBFFBBBRLL",
"BFFFBFFLRL",
"BFFBBBBLRR",
"BFBFFFBRLL",
"FFBFBBFRRL",
"BBBBFBBLLL",
"FBBBBFFLLL",
"FBFBBBBRLR",
"BFBBBBFLRL",
"FFFBBFFLRR",
"BFFBFBFLLR",
"BBFFFBBLLL",
"FBFBFFFRRR",
"FBBFFBFLLL",
"BFBFFFFLRR",
"BBBFFFBRRR",
"FBBBBFFLRL",
"FFBFBBBRRR",
"BFFBBFFLLL",
"FFBBFBBRRR",
"FBBBFBBRLL",
"BBBFBFBRRL",
"FBBBBFBRRL",
"FFBFBBBRLL",
"FBFBFBFLLR",
"BBFFBFBLRR",
"BFFBFBFRLR",
"BBBFBBFRRL",
"BBBFBBFLRL",
"FBFBFFBLLR",
"BFBFFBBRRR",
"FBFFFBFLLR",
"BBBFBFBRRR",
"BBBFFFFLLL",
"BBBFFBFRLL",
"BFBFFBBRLR",
"BFFFBBFRRR",
"BBBFFBBLLR",
"BFBFFFBLLL",
"FFFBBFBLRR",
"FBBFFBBLRL",
"FBBBBFFRLL",
"BFBFFBBRLL",
"BFFBBFBLRL",
"BBBBFFBRLL",
"BBFFFFBLLR",
"FFFBBBFLRL",
"FFFBBBBLRL",
"BBFFFFBRLL",
"FFFBBBFRLR",
"BBBFFFBRLL",
"FFBBFFBLLR",
"FFFBBBBRRR",
"BBFFBFFLLL",
"BFBBFBFRLR",
"BBBFBFFRRR",
"BFFBFFFLLL",
"BFBBFFBLLR",
"BBBFBBBLLL",
"FBBBBBBLLR",
"BBBFFFFRLL",
"FFBBFFBRLL",
"FBFBBBFRLR",
"BBFFFBFLRR",
"BBFBFBBRRR",
"BFBBFFFLLL",
"FBBFBBFLLR",
"FBFBBFBLLL",
"BFBBBBFLRR",
"BBBFBFFLLR",
"BFFBBBBRRL",
"BFBFFBBLRL",
"FFBFFBFLLL",
"FFBBFFFLLL",
"BFBBBFFLRL",
"BFFFFBBRRL",
"FFBBFBFLRL",
"FBBBBBBLRR",
"FFBFFBBRRL",
"BFFBBFBLRR",
"BBBBFFBRRL",
"BFFBBFFLLR",
"BFBBFFBRRL",
"FFFBBFBRRL",
"BFBBFFBLRL",
"FFBBFBBLLR",
"BFFFBFFLLR",
"BBFFBFBLRL",
"FBBBBFBRLL",
"FBBFBFBLLR",
"FFBFFFBLRL",
"FFBBFBBRRL",
"BBFFFFBRLR",
"FBFBFFBLLL",
"BFFBFFFLRR",
"BFBFBFFLLR",
"FFBFBFBLRL",
"BBFFFBBRRR",
"FBFBFBBLLR",
"FBFFBFBRLR",
"FBFFBBBRRR",
"FBBBFFBLLL",
"BBFBBBBRLL",
"FBBBFFFLRL",
"FFFBBFFRLR",
"BFBFFFBRRR",
"BFFBBFBRLL",
"FBBFFFFRLL"];
let max = 0;
for (let row of rows) {
    let value = 0;
    let x = 512;
    for (let char of row) {
        if (char == 'B' || char == 'R') {
            value += x;
        }
        x /= 2;
    }
    if (value > max) {
        max = value;
    }
}
console.log(max);
let seats = [];
for (let row of rows) {
    let value = 0;
    let x = 512;
    for (let char of row) {
        if (char == 'B' || char == 'R') {
            value += x;
        }
        x /= 2;
    }
    seats.push(value);
}
seats = seats.sort();
for (let i = 0; i < seats.length; ++i) {
    if (seats[i] == seats[i + 1] - 2) {
        console.log(seats[i] + 1);
        break;
    }
}