In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[7223, 2687, 5699, 'Y', 'x', 'C', 'x', '9205', 'n', '1569', '9831', '7723', 'n', 'U', 'E', 5513, 1065], [2581, 7999, 't', '9205', 'n', '1569', '9831', '7723', 'n', 'U', 'X', 273, 'p', 'Y', 6733, 8457]