The elf you helped yesterday has to go out and place his caches! He has a path to go on, but he is not sure how long it will take. Can you calculate the length of the path? Here is your test input:
0000.0.... ...0..0..0 .0.0....0. 0..0.....0 0..00...0. 00..000.0. 0..0..0..0 .0.00.000. ..00....0. 00.0....00
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Input Data File