ABABAAAAABABBBBAAAABBBBAABBBBBAABABABAABAAAAAAAAAB??????????????????????????????????????????????????
ABABAAAAABABBBBAAAABBBBAABBBBBAABABABAABAAAAAAAAAB???ABABAAAAABABBBBAAAABBBBAABBBBBAABABABAABAAAAAAAAAB
ABABAAAAABABBBBAAAABBBBAABBBBBAABABABAABAAAAAAAAABABABAAAAABABBBBAAAABBBBAABBBBBAABABABAABAAAAAAAAABAAB
-1