30 50
BBD BBB BB BB BBD BBB BB BDD BBA DD B BBD BDD BAA BBB BD AA BDA BB BA A DD AA BDD DD BBA BBB DA BBB BBB B DD BB BBB DD B BBD BDD BBA D DA BBB BB AA BBB BD BD BBB BA D 
AAC DAA AC DD CCC AAC DC CCC DDC AA A AAA AAC DDC DDA AA BC CCC AA CC C BC DC AAA AC DCC DCC BC ACC DDC D CC DA AAA BA C ACC ACC CCC A CC CCC CC CC DDD CC AC DAC DC C