In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['w', 'L', 3675, 'N', 'J', 2603, '1997', 'a', 'B', '9817', '1105', '2701', 'X', 'L', 'e', 'n', 'u', '2455', 't', 'k', 7517, 6535, 567, 'g', 'R', 'u'], ['H', 'u', 7489, 2843, 'L', 'Y', 'Y', 925, 1723, '1997', 'a', 'B', '9817', '1105', '2701', 'X', 'L', 'e', 'n', 'u', '2455', 't', 'u', 8185, 6953, 'L', 4557, 159, 'Q', 8771, 'R', 8451, 'H', 8055, 9447]