In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[4171, 6043, 8259, 't', 'B', '5553', '6011', 'B', 'F', '3693', '4459', 'M', '6147', 'e', '5807', '985', 's', '6057', '1995', 'e', '3329', 'u', 'O', 'L', 'C', 'D', 'W', 'b'], ['U', 'f', 4485, 7143, 'y', 'U', 'w', 2931, 3003, 'n', 2003, 'J', 6987, '5553', '6011', 'B', 'F', '3693', '4459', 'M', '6147', 'e', '5807', '985', 's', '6057', '1995', 'e', '3329', 'Q', 4355, 5945, 's', 4955, 7511, 7443, 'U', 2909, 'X', 95, 'k', 5477, 803]