In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2219, 787, 'c', 'L', 4449, 7525, 7273, 1553, 't', '9023', '4921', '785', 'B', 'C', 'q', 'y', 'r', '6863', 'c', 557, 'Z'], ['p', 'H', 'm', 8913, 'G', '9023', '4921', '785', 'B', 'C', 'q', 'y', 'r', '6863', 'y', 'U', 7937, 4349, 303]