In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['I', 's', 't', 'N', 'l', 'N', 8163, 'F', 'b', '6117', '4363', '7965', 'k', '333', '8153', '1361', 'v', '9501', '6905', 'r', '6619', '9647', '8947', '1155', 'U', 3469, 'z', 7841, 'Q'], [2331, 'T', 9229, 'Y', 'Y', 5147, 'r', '6117', '4363', '7965', 'k', '333', '8153', '1361', 'v', '9501', '6905', 'r', '6619', '9647', '8947', '1155', 'P', 1113, 'N', 'b', 'Y', 'E', 7865, 8231, 's', 'k', 2793, 'T']