In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['J', 'x', 'f', '9927', 'f', '3895', 'y', 'a', 'I', '9927', 'd', 'r', 'W', '6137', 'J', '2497', '1111', '8631', '8427', 'S', 'm', 'o', 'C', '8403', '1461', 'b', 'z', 'G', 7893, 683, 3149, 'y', 2661, 'T', 5805], [4639, 'X', 2973, 2847, 'S', 'g', 'f', '9927', 'f', '3895', 'y', 'a', 'I', '9927', 'd', 'r', 'W', '6137', 'J', '2497', '1111', '8631', '8427', 'S', 'm', 'o', 'C', '8403', '1461', 'a', 'o', 9691, 'Q', 'K', 'f', 6533, 1343, 'y', 'C', 'p', 'W', 7651, 8499, 2039, 'W', 2429, 'g', 955, 'm', 'T', 'M', 's']