In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[7925, 'k', 'B', 1717, 283, 7101, 'U', 3805, 'H', 1661, 1499, 'U', '9247', 'T', '3089', 'x', 's', 'R', '1029', 'p', 'K', '3923', 'B', 'q', '4755', '1097', 'T', 'h', 9769, 'X', 893, 3625, 'R', 'r', 'x'], [7203, 'D', 6305, 5641, 'H', 253, 'z', 'U', '9247', 'T', '3089', 'x', 's', 'R', '1029', 'p', 'K', '3923', 'B', 'q', '4755', '1097', 'T', 'W', 9803, 5789, 9037, 'l', 6601, 'I', 3979, 2103, 'U', 'r']