In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2415, 3515, 8385, '6671', '5231', 'h', 'C', '3443', 'd', '2045', 'U', 'B', '1755', '7609', 'a', '8835', 'x', 'U', 'G', '2763', 'k', 'q', '6375', 'g', 'N', 4291, 'V', 'U', 'D', 'n', 'b', 'h', 6171, 'L', 'y', 'B'], ['C', 215, 1591, 'y', 'B', 'O', 'e', 's', 'x', 'W', 8329, 'l', 2687, 'C', 845, 'U', 7069, 7891, '6671', '5231', 'h', 'C', '3443', 'd', '2045', 'U', 'B', '1755', '7609', 'a', '8835', 'x', 'U', 'G', '2763', 'k', 'q', '6375', 'a', 7649, 'b']