In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['i', 'k', 'K', 9921, 'I', 5193, 4017, 5923, 'Z', 2293, 865, 'J', 'P', 'Q', '981', '943', '875', '3353', '4021', 't', '2269', '4875', 'W', 'Q', 'c', 'D', 'D', 'q', 'c', 'x', 3171, 'T', 'O', 'z', 'p', 'r', 'Q', 'X', 7273], ['h', 'n', 't', 's', 'Q', '981', '943', '875', '3353', '4021', 't', '2269', '4875', 'W', 'Q', 'c', 'D', 'D', 'v', 'P', 6433, 'L', 1493]