In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['O', 6141, 9393, 'n', 'E', 'a', 6379, 'o', 5547, '943', 'm', '5087', 'M', 'V', '1905', '6943', 'z', '3875', 'S', '4095', 'Y', 'h', 'k', 2443, 4149, 'U'], ['Y', 'U', 3289, 'g', 1939, 3125, 'B', 6217, 'k', 'c', '943', 'm', '5087', 'M', 'V', '1905', '6943', 'z', '3875', 'S', '4095', 'Y', 'A', 7615, 7999, 'f', 'u']