In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[7317, 7209, 'O', 'U', 'P', 4765, 'm', 't', 's', 7853, 455, 'F', '9939', '8177', 'E', '4121', '6421', '8503', 'L', 'b', 'G', '9485', 'G', 'X', 9863, 'q', 2687, 'W', 'u', 6017], ['e', 't', 3415, 'F', '9939', '8177', 'E', '4121', '6421', '8503', 'L', 'b', 'G', '9485', 'X', 2011, 'B', 'X', 'y', 7167, 'O']