In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2109, 8121, 8683, 3595, 6905, 'M', 2719, 'W', '2671', '155', '637', '6757', 's', 'w', '303', 'e', '5977', '983', 'l', '3155', 'e', 'b', '4919', '2219', '4033', 'W', 'I', '1487', '231', 'h', 6051, 3689, 7723, 'K', 5153, 'W', 8691], [71, 'X', 'M', 5277, 'e', 787, 1055, 'G', 'G', 'x', 'C', 'I', 'U', 5281, 6493, 5233, 6209, 'W', '2671', '155', '637', '6757', 's', 'w', '303', 'e', '5977', '983', 'l', '3155', 'e', 'b', '4919', '2219', '4033', 'W', 'I', '1487', '231', 'F', 5755, 3113, 9939, 1325]