print("ABCDEFGHIJKLMNOPQR") print("BABCDEFGHIJKLMNOPQ") print("CBABCDEFGHIJKLMNOP") print("DCBABCDEFGHIJKLMNO") print("EDCBABCDEFGHIJKLMN") print("FEDCBABCDEFGHIJKLM") print("GFEDCBABCDEFGHIJKL") print("HGFEDCBABCDEFGHIJK") print("IHGFEDCBABCDEFGHIJ") print("JIHGFEDCBABCDEFGHI")