In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[6905, 'r', 2437, 5127, 'l', 'G', '2451', '7519', 'E', '5683', '747', '8891', '4753', 'l', '9801', '463', '6841', '6753', '5893', '8549', 'V', '6523', '8055', 'I', 't', 1715, 'Y', 2473, 5659, 'B', 7575, 'O', 3335, 321, 'X', 'M'], [4473, 7069, 'E', 4811, 9693, 3375, 8589, 1441, 'W', 8231, 9043, 'l', 'G', '2451', '7519', 'E', '5683', '747', '8891', '4753', 'l', '9801', '463', '6841', '6753', '5893', '8549', 'V', '6523', '8055', 'i', 5579, 6275, 7721, 8873, 241, 9339, 'Y', 'Y', 4645, 1875]