In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['b', 'J', 4123, 8953, 'x', '3347', '6805', 'd', '2169', '6185', 'J', 'O', 'O', 'E', 'O', 'P', 4491, 8869], ['Q', 6699, 'f', 'I', 'C', 'c', 5879, '3347', '6805', 'd', '2169', '6185', 'J', 'O', 'r', 'e', 'X', 6427]