In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['y', 7251, 'M', 'k', '2245', 'e', '4405', '6975', '1137', 'q', '1265', '4515', 'u', 3995], ['e', 'E', 'K', 'p', '2245', 'e', '4405', '6975', '1137', 'q', '1265', '4515', 'B', 2393, 4453, 'x', 7481, 4945]