In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['U', 8875, 6833, 'o', 4855, 'H', 'a', 'q', '4883', 's', 'k', '9019', 'b', 'G', 'C'], ['J', 1869, 'a', 'q', '4883', 's', 'k', '9019', 'T', 335, 'F', 'c', 'x', 'K']