In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['x', 'c', 'J', 'M', 2197, 8229, 'z', 'e', 'u', 6971, 'p', 1453, 'T', 'R', 'n', 2407, '4443', 'n', '8369', 'R', 'C', '401', 'E', '4879', 'U', '4341', '919', 'U', 'Z', 'O', '9629', '7765', 'm', 'l', 'x', '9117', '4309', '8157', '2997', 'u', 4603, 4335, 6763, 1897, 6097, 'Q'], [909, 4877, 6293, 't', 'W', 3819, 'Q', 8631, 5715, '4443', 'n', '8369', 'R', 'C', '401', 'E', '4879', 'U', '4341', '919', 'U', 'Z', 'O', '9629', '7765', 'm', 'l', 'x', '9117', '4309', '8157', '2997', 'F', 'Y', 9241]