20
AAAAA*AAAAAA*AAA*A*A
AAAAAATA*AA*AAA**AAA
AA**AAAAA*AA*AAAAA*A
*AAAA*A**ATTAAA***AA
A**T*AAAT*AAAA*AAAAA
A*AAA*AAAATAAAA*ATAA
AAATA*****TAAAAAA**A
A*AAA***ATAAAAAAAA**
AATTT*AAA*AA*T*AAAAT
AAAAAAA*AAAAAAAAAAAA
AA*AAA*AA*A*AAAAAAT*
A*A**AAATAA*AAAAA*AA
*ATAATAAAAAAAAAAAA**
AAAATAA*AAA**AATAAA*
AAA*AAA*AAA*AAAAAAAA
AAAA*AAATAAAAA*AA*AA
T*TAA*AATAAAAATAAAAA
AA*AAA*AATAAAA*AAAAA
*A*A*A*AATAAA*AAAAAA
*AAA***AAAAAAAAA*AAA