In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['w', 3897, 'U', 'a', '455', '6499', '8975', '9003', 'O', 'j', 'T', 'P', 'C', 'z', 5141, 1751, 6731, 'r'], ['B', 8071, 703, 'G', 885, 'Z', 2391, 1749, 4177, 'U', 'a', '455', '6499', '8975', '9003', 'O', 'j', 'T', 'D', 8751, 'y', 2941]