In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['M', 'x', 'i', 5915, '7171', '9029', 'X', 'O', '1313', 'Q', '8171', 'B', '4803', 't', 9281], [4415, 9545, 4349, 6799, '7171', '9029', 'X', 'O', '1313', 'Q', '8171', 'B', '4803', 'C', 9953, 'E', 973, 'E', 1315]