problem #297 - 염기서열 커버

염기서열 커버

Time Limit: 1 SecMemory Limit: 1024 MiB

Example Input 1

4 5
a..tt
gc...
a.g.t
.c.ag

Example Output 1

Example Input 2

4 1
a
g
c
t

Example Output 2

Example Input 3

4 4
a...
.c..
..g.
...t

Example Output 3

Language-Specific Restrictions