In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[633, 4875, 'W', '9573', 'B', 'd', 'S', 'A', 'v', '1861', 'g', '6215', '4367', 'B', '7991', '6645', 'f', 4699, 'A', 4739, 'E', 'X', 'i', 'u', 'Z', 'W', 6891, 'T', 5833], ['f', 9515, 'L', 'N', 'T', 'A', 'g', 9339, 6073, 'W', '9573', 'B', 'd', 'S', 'A', 'v', '1861', 'g', '6215', '4367', 'B', '7991', '6645', 'e', 6443, 'O', 'E', 7387, 9285, 'f', 'K', 'h', 'L', 'g', 'Y', 1663]