30 50
A AADDDDDDDDD AAADDDDDDDDD AABDDDDDDDDD CDDDDDDDDD ABDDDDDDDDD AADDDDDDDDD CCCCCCCCCCC ACDDDDDDDDD BBDDDDDDDDD BBBBBBBBBBB BCDDDDDDDDD BBDDDDDDDDD AADDDDDDDDD AADDDDDDDDD AAADDDDDDDDD AADDDDDDDDD ABDDDDDDDDD ABBDDDDDDDDD BDDDDDDDDD AACDDDDDDDDD AAADDDDDDDDD BDDDDDDDDD ACDDDDDDDDD AAADDDDDDDDD CCDDDDDDDDD CCDDDDDDDDD ABBDDDDDDDDD AAADDDDDDDDD BBDDDDDDDDD AAADDDDDDDDD BBDDDDDDDDD ADDDDDDDDD CCDDDDDDDDD AABDDDDDDDDD AADDDDDDDDD AAADDDDDDDDD ABDDDDDDDDD ADDDDDDDDD AACDDDDDDDDD AABDDDDDDDDD AACDDDDDDDDD AAADDDDDDDDD ADDDDDDDDD BBDDDDDDDDD AAADDDDDDDDD ABBDDDDDDDDD AABDDDDDDDDD AAADDDDDDDDD BCDDDDDDDDD 
B DDDDDDDDDDD BBDDDDDDDDDD CCDDDDDDDDDD DDDDDDDDDD CDDDDDDDDDD CDDDDDDDDDD DAAAAAAAAAA BDDDDDDDDDD CCDDDDDDDDD CAAAAAAAAAA DDDDDDDDDDD DDDDDDDDDDD BCDDDDDDDDD BBDDDDDDDDD CDDDDDDDDDDD BDDDDDDDDDD DDDDDDDDDDD CCDDDDDDDDDD CDDDDDDDDD BBDDDDDDDDDD BBBDDDDDDDDD DDDDDDDDDD DDDDDDDDDDD BBCDDDDDDDDD DDDDDDDDDDD BDDDDDDDDDD CCCDDDDDDDDD CCCDDDDDDDDD CDDDDDDDDDD BDDDDDDDDDDD ACDDDDDDDDD CDDDDDDDDD ADDDDDDDDDD DDDDDDDDDDDD CCDDDDDDDDD CCDDDDDDDDDD CCDDDDDDDDD DDDDDDDDDD BDDDDDDDDDDD CDDDDDDDDDDD DDDDDDDDDDDD BCDDDDDDDDDD BDDDDDDDDD ADDDDDDDDDD DDDDDDDDDDDD CDDDDDDDDDDD CCCDDDDDDDDD BCCDDDDDDDDD ADDDDDDDDDD