In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[6693, 'B', 'z', '5037', '3765', 'U', 'R', 'h', 'X', '8609', 'K', 8159, 6899, 1343, 'T', 1043, 9689], [647, 7633, 'Y', 537, 'i', 'A', 'L', '5037', '3765', 'U', 'R', 'h', 'X', '8609', 'b', 6543]