In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[1529, 'l', 'U', 'b', '7333', '3967', 't', 'u', '7439', 'W', 'V', 'X', 3875, 'R'], ['c', 'o', '7333', '3967', 't', 'u', '7439', 'W', 'G', 'O', 9451]