In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['e', 'W', 'x', 6581, 'y', 4191, 'u', 'B', '6197', '6435', '4975', '5435', 'r', '7329', '4033', 'k', 'j', '5373', '5673', 'd', 'V'], ['i', 'O', 'Z', 211, 1503, 'X', 4315, 'G', 'u', 'B', '6197', '6435', '4975', '5435', 'r', '7329', '4033', 'k', 'j', '5373', '5673', 't', 'C']