In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[9639, 3119, 8145, 4687, 'N', 'W', 'A', 'l', 's', 2579, 'a', 'B', 'v', 2737, 1865, 2575, 'A', '2851', 'X', '2517', 'I', 'U', 'P', 'W', 'I', '8261', 'H', '4889', 't', '6467', '2853', 'c', '2377', 'o', 'G', 'B', 'K', 1107, 3403, 6471], [3049, 'o', 'W', 'j', 'u', 7231, 2155, 3067, 7441, 'A', '2851', 'X', '2517', 'I', 'U', 'P', 'W', 'I', '8261', 'H', '4889', 't', '6467', '2853', 'c', '2377', 'o', 'G', 'h', 'x']