In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['o', 6029, 3977, 'p', 2461, 6469, 'C', 'E', 'u', 'q', '3919', 'v', '1493', 'a', 'R', 'f', '1009', '869', 'w', 'n', 'u', 'y', 6143, 3229, 8999, 3119, 'n', 'W', 'K'], ['a', 'j', 'k', 'P', 'H', 'B', 'Q', 'z', 'U', 'u', 'q', '3919', 'v', '1493', 'a', 'R', 'f', '1009', '869', 'w', 'n', 'u', 'E', 6917, 'R', 3797, 1363]