In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[647, 7683, 5669, 'A', 5201, 'R', 'K', 't', 2403, 'r', '8737', '4681', '4819', '7891', 'P', 'V', '603', '4455', 'c', 'i', 'B', '2343', '2911', 'W', 'w', '4149', 'h', 5765, 'K', 9127, 'y', 'G', 6895, 6235], [819, 3435, 6893, 3923, 5291, 5919, 7681, 'A', 7597, 'o', 443, 9827, '8737', '4681', '4819', '7891', 'P', 'V', '603', '4455', 'c', 'i', 'B', '2343', '2911', 'W', 'w', '4149', 'x', 7375, 6667, 7687, 6181, 7421]