4864: P7645 [COCI2012-2013#5] ARHIPELAG(普及-)

Memory Limit:128 MB Time Limit:1.000 S
Judge Style:Text Compare Creator:
Submit:1 Solved:1

Description

Input

Output

Sample Input Copy

5 3
...
.X.
.X.
.X.
...

Sample Output Copy

X

HINT