In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['w', 4579, 'D', 'S', 'U', 3133, 'l', '8433', '9589', '4521', 'Q', '7747', '9815', '1555', 'j', 'L', 'f', 5541, 'Y', 't', 9875], [5045, 5033, 'O', 3029, 'B', 'I', 3747, '8433', '9589', '4521', 'Q', '7747', '9815', '1555', 'j', 'L', 'Z', 'l', 2659, 1215, 5449, 6221, 5921]