In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['P', 'E', 6537, 1727, 9015, 'F', 1393, 'e', 'w', 'x', 'D', 7137, 'T', 'f', 'K', '4097', 'A', '5591', '1951', 'I', 'c', '6661', 'W', '689', 'R', '5303', '3799', '8421', 'p', 2093], ['c', 5775, 7279, 'K', 283, 'o', 6197, 'o', 4705, 'F', 8775, 'f', 'K', '4097', 'A', '5591', '1951', 'I', 'c', '6661', 'W', '689', 'R', '5303', '3799', '8421', 'U', 'K', 7259, 'd', 'T', 8237, 'S']