In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['s', 4245, 'B', 'L', 7401, 'H', 8755, 'f', 171, 'x', 'V', 'v', 7713, 'I', 5219, 'N', 'h', 8163, 9873, '4455', '5963', '5831', 'U', 'o', '2769', 'y', '8631', 'o', 'i', 'W', '4547', 'F', '7949', '9323', 'B', '1133', '7613', 'K', 'G', 'L', '1141', 'P', 's', 6775, 'J', 'c', 'W', 'C'], ['p', 2519, 9871, 'e', 'H', 'l', 9289, 4323, 8323, 't', 'w', 2759, 8563, 's', 'B', 'L', 2149, 49, 'Z', 'h', '4455', '5963', '5831', 'U', 'o', '2769', 'y', '8631', 'o', 'i', 'W', '4547', 'F', '7949', '9323', 'B', '1133', '7613', 'K', 'G', 'L', '1141', 'P', 'f', 7261, 2603, 'X', 's', 'z', 'f', 8711, 'x']