In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['x', 'j', 855, 8135, 'b', 4725, 'l', 'E', 'a', 'm', 'Q', '4061', '6711', 'O', 'o', '7621', 'I', 'B', '8937', 'W', '9519', '9091', '2379', '437', 'E', 'u', 's', '2911', 'Z', 'x', 'H', 'k', 'd', '9743', 'C', 2521, 'a', 'c', 8529, 'X', 3995], [7391, 1387, 'C', 'Q', 'B', '4061', '6711', 'O', 'o', '7621', 'I', 'B', '8937', 'W', '9519', '9091', '2379', '437', 'E', 'u', 's', '2911', 'Z', 'x', 'H', 'k', 'd', '9743', 'g', 6781, 5535, 8861, 'i']