30 50
ADDDDDDDDDD ADDDDDDDDDD ADDDDDDDDDD BDDDDDDDDDD BDDDDDDDDDD CDDDDDDDDDD AADDDDDDDDDD AADDDDDDDDDD AADDDDDDDDDD AADDDDDDDDDD AADDDDDDDDDD AADDDDDDDDDD ABDDDDDDDDDD ABDDDDDDDDDD ABDDDDDDDDDD ACDDDDDDDDDD ACDDDDDDDDDD BBDDDDDDDDDD BBDDDDDDDDDD BBDDDDDDDDDD BBDDDDDDDDDD BBDDDDDDDDDD BCDDDDDDDDDD BCDDDDDDDDDD CCDDDDDDDDDD CCDDDDDDDDDD CCDDDDDDDDDD AAADDDDDDDDDD AAADDDDDDDDDD AAADDDDDDDDDD AAADDDDDDDDDD AAADDDDDDDDDD AAADDDDDDDDDD AAADDDDDDDDDD AAADDDDDDDDDD AAADDDDDDDDDD AAADDDDDDDDDD AABDDDDDDDDDD AABDDDDDDDDDD AABDDDDDDDDDD AABDDDDDDDDDD AACDDDDDDDDDD AACDDDDDDDDDD AACDDDDDDDDDD ABBDDDDDDDDDD ABBDDDDDDDDDD ABBDDDDDDDDDD A BBBBBBBBBBB CCCCCCCCCCC 
BDDDDDDDDDD CDDDDDDDDDD DDDDDDDDDDD CDDDDDDDDDD DDDDDDDDDDD DDDDDDDDDDD BBDDDDDDDDDD BCDDDDDDDDDD BDDDDDDDDDDD CCDDDDDDDDDD CDDDDDDDDDDD DDDDDDDDDDDD CCDDDDDDDDDD CDDDDDDDDDDD DDDDDDDDDDDD BDDDDDDDDDDD DDDDDDDDDDDD ACDDDDDDDDDD ADDDDDDDDDDD CCDDDDDDDDDD CDDDDDDDDDDD DDDDDDDDDDDD ADDDDDDDDDDD DDDDDDDDDDDD ADDDDDDDDDDD BDDDDDDDDDDD DDDDDDDDDDDD BBBDDDDDDDDDD BBCDDDDDDDDDD BBDDDDDDDDDDD BCCDDDDDDDDDD BCDDDDDDDDDDD BDDDDDDDDDDDD CCCDDDDDDDDDD CCDDDDDDDDDDD CDDDDDDDDDDDD DDDDDDDDDDDDD CCCDDDDDDDDDD CCDDDDDDDDDDD CDDDDDDDDDDDD DDDDDDDDDDDDD BBDDDDDDDDDDD BDDDDDDDDDDDD DDDDDDDDDDDDD CCCDDDDDDDDDD CCDDDDDDDDDDD CDDDDDDDDDDDD B CAAAAAAAAAA DAAAAAAAAAA