26 13
ABCDBBB ADABDDBADDDDCDBBBC AADACACDBBDBABBBBAC DADCDAB ADABABBABCCC CDBCADCAD ADBDDAA CCABCCD DDBBADABDCDBACA CCACCCDDACCCCCABCDBCCBC ACDACCCACBDDADDACBBDABBB BCCABBACBACCBCBDDDBA AABCBCBCDADBBABADD 
BDDDCAD DBDCBBDDDCBBAADBAD DCADCBCDCCADBCACBDD CAABACC CDADDCDCDDBB CCDBCBCDD BDACDAB CBCCADC DCBACDDDBAABBBB DDDDDBAADDCBDCAADBADACC ABDAADDABBACDBAAAADCBACB DDDCBBBDCBBBADDDDBDA DBAAABAABCBAADCAAD