In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[4789, 't', 'a', 6489, 5377, 6495, 'I', 'V', 679, '8249', 'X', 'b', '5457', '247', '8243', 'U', 'd', 't', 'V', 4131, 'z', 'k', 'o', 'E'], ['R', 'U', 9825, '8249', 'X', 'b', '5457', '247', '8243', 'U', 'd', 't', 'X', 'I', 'v', 'I']