3 50
A B D A D C A C C D D A D B A C B A A C B B D D C A D C A C A B A B B D B D C A B B D C C C B D A A 
B C B A A A B C B A D C C C D B D D D A D B C B A C D B C D C C A A B D B B C D A A C C D D D A B A