In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['Z', 'B', 'L', 'Q', 'L', 5135, 1189, 'x', 'g', 'y', 'x', '73', 'N', 'D', 'X', 'm', '7799', '2875', '8507', 'a', 'l', 'V', 4653, 't', 'e', 'N'], [7475, 'u', 'K', 'y', 'x', '73', 'N', 'D', 'X', 'm', '7799', '2875', '8507', 'a', 'R', 'u', 6757, 'b', 'q', 'E', 3377, 'K', 9993, 4191]