In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['C', 6913, 'M', 7967, 'c', 'U', '2267', 'y', '1441', 'N', '4311', 'C', 'L', 'E', 'J', 8985, 'D'], ['O', 4163, 'm', 'v', 'q', '2267', 'y', '1441', 'N', '4311', 'C', 'A', 1873, 2291, 'K']