In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[4421, 8257, 'a', 3331, 'z', 2809, 2435, 'y', 'T', 481, 'R', 8297, 4683, 'H', '9741', 'E', '9733', '5029', 's', '7549', 'T', 'n', '4621', '6799', 's', '4971', 'R', '1875', '6885', 'o', 'r', '2397', '6727', '641', 'M', '5021', 'p', 'T', 'x'], [2699, 6255, 'U', 's', 'H', '9741', 'E', '9733', '5029', 's', '7549', 'T', 'n', '4621', '6799', 's', '4971', 'R', '1875', '6885', 'o', 'r', '2397', '6727', '641', 'M', '5021', 'p', 'K', 'J', 'r', 7439, 'l', 4075, 'r', 'd', 2661, 'n', 'm']