In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['Y', 8523, 8685, 1487, 'K', 4115, 'P', 'V', 4207, 'K', 4945, 'b', '2607', 'J', '545', '8563', '6803', 'L', 'X', '837', '8729', '5361', 'Y', '2119', 'e', 'c', 'p', 't', 'e', 'L', 'w', 'B', 2661], [6209, 'u', 'G', 'K', 's', 919, 6567, 'p', 't', 'M', 'q', 3163, 583, 'F', 7597, 1559, 'k', 'b', '2607', 'J', '545', '8563', '6803', 'L', 'X', '837', '8729', '5361', 'Y', '2119', 'e', 'c', 'p', 't', 'Q', 9551, 9865, 'g', 'x', 'M', 6101, 7411, 'P', 'p', 2419, 41, 1937, 'U']