In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['L', 687, 'Y', 'p', 5031, 1213, 3435, 'F', 2609, 1405, 4531, 'e', 4245, 9853, 'z', 3901, 2971, 'P', 9547, 'K', 'U', 'i', 'k', 's', 'U', '8701', '9247', 'S', '9635', 't', '8233', '1487', 'B', '3961', '7239', '5713', '837', '2389', 'D', '9257', '2989', '1531', '79', '201', '9635', 'g', 'e', 'o', 'Q', 'p', 'U', 'x', 279, 9639, 4293, 'K', 'L', 4531, 'k', 4261, 'm'], [4685, 'd', 'k', 's', 'U', '8701', '9247', 'S', '9635', 't', '8233', '1487', 'B', '3961', '7239', '5713', '837', '2389', 'D', '9257', '2989', '1531', '79', '201', '9635', 'g', 'N', 'Q', 8267, 5771, 4741, 'n', 3993, 'y', 6435, 'j', 't', 'b', 'y', 'z', 'z', 'p', 1263]