In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['o', 2649, 'f', 't', 9913, 'x', 2039, 'x', 'W', 'H', 5485, 'z', 5817, 'm', '3123', 'P', 'x', 'A', 'Y', '6527', '5243', '307', '1767', '7697', 'a', 's', '769', 'L', 'w', 'L', 'q', 3925, 'c', 4381, 'H', 9639, 7745, 13], [539, 'C', 2073, 7185, 2771, 5235, 'M', 9897, 2393, 8515, 4239, 'A', 'F', 'b', '3123', 'P', 'x', 'A', 'Y', '6527', '5243', '307', '1767', '7697', 'a', 's', '769', 'L', 'c', 1245]