30 50
AAA CC CC AAA AAA AAB BB BC B AB AA AB AAA AAC ADBCABAAAAAAAAAAAAAAAAAAAAA BB AC CC BB AAB AAB AAA AAA AAA AA AAB A AC C BB BB A ABB CAAAADADBAAAAAAAAAAAAAAAAAA BC AB AAC AA AAA DACBACAAAAAAAAAAAAAAAAAAAAA AAC A AAA B AAA ABB AA AA AA ABB 
BCD AD BD BBC CCD CCC CD DD D CD BD CC CCC BDD ADBCAACAAAAAAAAAAAAAAAAAAAA AD BD DD DD CDD DDD DDD BDD BBB CD CCD C DD D AC CC B CDD DCBBAAAAAAAAAAAAAAAAAAAAAAA AD DD DDD BC BBD ACBDDAAAAAAAAAAAAAAAAAAAAAA BBD D CDD C BCC CCD CC DD BB CCC