In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['D', 5239, '9901', '5231', 'b', '1649', 'k', '5517', 'b', 'O', 4459, 'j', 4127], [5241, 'X', 3789, 9117, 6373, 2597, 'G', '9901', '5231', 'b', '1649', 'k', '5517', 'b', 'd', 'y', 'C', 6683, 'l', 673, 'W']