In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[5811, 5575, 'U', 'k', 'c', 'u', 'r', 'B', '3485', '3423', 'F', 'd', 'L', 'i', 'Y', '9189', 'T', 'f', 'Y', '133', 'S', 'r', 4311, 'M', 8175, 2687, 5699, 3631, 9797, 'y', 'F', 'C', 6961], [7713, 'X', 'p', 'D', 1009, 7361, 'W', '3485', '3423', 'F', 'd', 'L', 'i', 'Y', '9189', 'T', 'f', 'Y', '133', 'S', 'b', 'E', 4515, 'A', 'I', 8805, 'I', 985]