In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[3811, 4971, 2615, 'e', 4227, 'w', 'O', '2203', 'P', '9355', 'O', 'E', 'S'], [1809, 'X', 'w', 'O', '2203', 'P', '9355', 'O', 'w', 'K', 's', 1455]