In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['S', 953, 'u', 'T', 1429, 'k', 'P', 7763, 'q', 8563, 'P', '1919', 'H', 'i', '7079', 'A', 'k', '1415', 'p', '1921', 't', '8715', 'u', 'k', 'y', 'p', '8387', 'B', '9099', 'y', 'S', '9891', '4611', 'F', 6637, 5273, 'I', 'I', 6569, 'r', 4813, 'P', 'P', 't', 'W', 'M', 'Y', 5857, 9371, 'U', 5739], [5929, 3627, 1279, 5535, 4423, 9745, 9555, 'P', 'P', '1919', 'H', 'i', '7079', 'A', 'k', '1415', 'p', '1921', 't', '8715', 'u', 'k', 'y', 'p', '8387', 'B', '9099', 'y', 'S', '9891', '4611', 'g', 811, 'C', 'T', 'A', 9579]