In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['i', 'Q', 693, 'q', '2435', 'b', 'b', '2743', '4985', 'Y', 'f', 's', 8369, 3691, 3555], ['c', 5475, '2435', 'b', 'b', '2743', '4985', 'Y', 'f', 'm', 'a', 'n', 5403, 'a', 401]