input.txt

initial state: ###.......##....#.#.#..###.##..##.....#....#.#.....##.###...###.#...###.###.#.###...#.####.##.#....#

..... => .
#..## => .
..### => #
..#.# => #
.#.#. => .
####. => .
##.## => #
#.... => .
#...# => .
...## => .
##..# => .
.###. => #
##### => #
#.#.. => #
.##.. => #
.#.## => .
...#. => #
#.##. => #
..#.. => #
##... => #
....# => .
###.# => #
#..#. => #
#.### => #
##.#. => .
###.. => #
.#### => .
.#... => #
..##. => .
.##.# => .
#.#.# => #
.#..# => .