In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['L', 'H', '1285', '7917', 'r', 'S', 'y', 'b', '8073', 'Y', 't', '19', 'y', 'b', 'T', 'J', '9681', '6409', '6989', 'o', '6675', 'S', 'K', '75', 'W', 4663, 6431, 'm', 5521, 'X'], ['C', 125, 'Q', 'Q', 5817, 'K', 'd', 9399, '1285', '7917', 'r', 'S', 'y', 'b', '8073', 'Y', 't', '19', 'y', 'b', 'T', 'J', '9681', '6409', '6989', 'o', '6675', 'S', 'K', '75', 'z', 4721]