In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['Y', 'd', 'D', 7079, 'K', 'u', '2411', 'x', '529', '9133', '5763', '5979', 'J', 'U', '6251', 'C', 'w', '5571', 'R', 385, 'V', 7897, 'O'], [3289, 't', 379, 315, 'Z', '2411', 'x', '529', '9133', '5763', '5979', 'J', 'U', '6251', 'C', 'w', '5571', 'T', 'J', 'b', 6423, 'b', 'V', 6643]