In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[4143, 9623, 'k', 'Z', 1355, 4371, 5553, 'U', 8081, 843, 7307, 8537, 841, 6443, 9873, 'b', 4969, 1189, 9481, 9225, 6739, 4269, 3997, 9511, '5641', '8319', '5809', 'F', '7875', '8699', 'p', '1431', 'K', 'R', '53', '4049', 'b', 'b', '5823', 'E', '1073', '8199', '6801', '8501', '1971', '6131', '4225', '847', 'N', 4305, 'M', 2381, 'W', 7817, 'x', 7221, 4341, 'k', 4235, 'z', 9923, 'w', 'c', 7701, 'k', 6841, 9359], [831, 8989, 'O', 9915, 829, 'y', 2567, 8737, 'P', 1805, 'u', 'b', 3579, 6313, 455, 'E', 1193, 2669, 6121, 7167, 'P', '5641', '8319', '5809', 'F', '7875', '8699', 'p', '1431', 'K', 'R', '53', '4049', 'b', 'b', '5823', 'E', '1073', '8199', '6801', '8501', '1971', '6131', '4225', '847', 'G', 1015, 'c', 6677, 8939, 2951, 'L', 'd', 5797, 2413, 7741, 3025, 5391]