In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[937, 9373, '185', '8861', '5333', '3083', 'J', '8399', 'F', 'A', '9999', 'U', 4901, 'x'], [1281, 6691, 'e', 817, 'R', 'Y', 65, 2497, 9641, '185', '8861', '5333', '3083', 'J', '8399', 'F', 'A', '9999', 'Q', 'a', 4069, 'L']