In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[7669, 587, 'n', 'C', 'b', 5667, 'X', 7883, 'b', 7055, 8469, 7761, 'g', 6365, 5505, 'd', 'X', 6619, 'C', '4199', 'B', 'b', '3091', '2093', '3565', 'Z', 'Z', '6963', '6115', 'l', '109', 'S', 'b', 'M', '5565', '6481', 'n', '9901', '4917', 'g', 'e', 6861, 'C', 5357, 9919, 5591, 'R', 'J', 8695, 'B', 137, 'a'], ['U', 2641, 'f', 'H', 'M', 2357, 5119, 'Z', 'Z', 879, 'f', 'r', 'k', 'E', 7061, 'C', '4199', 'B', 'b', '3091', '2093', '3565', 'Z', 'Z', '6963', '6115', 'l', '109', 'S', 'b', 'M', '5565', '6481', 'n', '9901', '4917', 'x', 681, 3033, 'I', 'E', 'r', 9847, 3389, 9847, 9211, 7149, 7795, 3755, 187, 's']