8
...O....
........
..P.....
.K......
........
........
........
X....QBB

输出：4

解释：

...O....
.1......
..P.....
2K......
........
.3......
........
4....QBB

hack题解：
https://www.luogu.com.cn/article/u2ge8s2h https://www.luogu.com.cn/article/pgelkiad https://www.luogu.com.cn/article/l0uirdym

请求撤下并添加数据。