15 20
*.*..**.*.*....*...*
.***.....**.*..*..**
...........*..*....*
*.*.......*.*....**.
*.......*.***.......
*..*.*.****.***.....
*.*...*.*..*...*...*
*..*.**.***...*...**
.....*....*.**......
.....*.......*...*..
**.....*.*....**..*.
*..*....**.........*
**.*..**.**...*.*.*.
...*....***.*.*...*.
*.*...*...**.*..**.*