In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[889, 8013, 6413, 'n', '4333', 'x', '1325', '985', 'W', 'P', '6373', 'r', '5913', '3101', 'R', 'v', 8147, 'Y', 9821, 5579, 'A'], ['T', 'H', 'n', '4333', 'x', '1325', '985', 'W', 'P', '6373', 'r', '5913', '3101', 'R', 'n', 1493, 'o', 'b', 'r', 'l', 'X', 2113, 2947, 3893, 'f', 9413]