In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['R', 'u', 4757, 'R', 't', '3401', '477', '2911', 'e', 'k', 'N', 'u', 3541], [8817, 'q', 'j', 9281, 'w', 't', '3401', '477', '2911', 'e', 'k', 'O', 'B', 't', 'Y']