In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[9403, 2937, 'u', 'Y', 'Q', 'f', 'c', 'S', 477, 2551, 'A', 's', 'q', 5983, 'K', 5363, '2681', '6821', '7743', 'I', '5899', '7711', 'D', '1765', '3079', 'Z', '8999', '8547', 'n', 'u', 'j', '6917', 'o', 'u', '1041', '7723', '6359', 'L', '9413', 'q', 3349, 'Q', 'S'], [7879, 4085, 9765, 4999, '2681', '6821', '7743', 'I', '5899', '7711', 'D', '1765', '3079', 'Z', '8999', '8547', 'n', 'u', 'j', '6917', 'o', 'u', '1041', '7723', '6359', 'L', '9413', 'M', 5931, 4081, 'k', 2021, 4683, 'm', 1743, 'l', 'y', 9725, 721, 'r', 6351, 6843, 'F', 'Y']