프롬프트 없음
5 5 5 aaaaa ..a.. bbabb ..a.. aaaaa 3 5 ..abb ..a.. aaaaa 5 2 a. a. aa a. a. 1 2 bb 1 5 bbabb 2 5 aaaaa ..a..
3
출처: USACO 2016 US Open Contest, Platinum Problem 2. Bull in a China Shop