In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['X', 'K', 'i', 3691, 'W', 'L', 'k', 'n', '87', 'P', 'S', '3303', 'D', 865, 4437, 5955, 'V'], ['a', 'z', 'q', 'c', 'M', 'L', 'k', 'n', '87', 'P', 'S', '3303', 'K', 7479, 539, 623, 'h', 'e', 2121]