15 4
b..#.##.#...#dc
..#.d...#.#bc..
#cb.....##.b#bb
#.#.....#..#...
d.#dc#.....#b.b
....c#b..#...##
...##.....b.#c.
##b.#.b.bb.....
..bA.b..#..#b#b
.#...#.....c#.#
.#.D#....#.b.cb
..b#.b#.#bbb.#b
#.B.#..C.bd##.#
...a#....b....#
.#..#.#b###.d..
