In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['Y', 3139, 'C', 'G', 'y', 1155, 'b', 'i', 'Q', 'p', '2431', 'O', 'n', '6495', '2389', 'c', '925', '2407', '3985', '7945', 'n', 'n', 3073, 'm', 'y', 'V', 'p', 9923, 'q', 6203, 'W'], ['b', 'l', 19, 8607, 'Q', 'p', '2431', 'O', 'n', '6495', '2389', 'c', '925', '2407', '3985', '7945', 'n', 'M', 'f', 6469, 4579, 911, 'f', 'e']