In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['P', 'I', 'e', 'S', 'K', 'n', 'T', 'W', '443', '8213', 'I', 7533, 3259], [3951, 'r', 6575, 7589, 'K', 'n', 'T', 'W', '443', '8213', 'H', 9733, 'm']