In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['H', 'u', 8939, 'E', 's', 4735, 'T', 9457, 'C', 3143, 3407, 't', 'x', 'g', 'E', '2233', 'x', '9715', 'J', 'P', '6451', '9251', 'H', 'h', '3889', 'N', '321', 'r', 'B', 'b', 'e', 'b', '6237', 'N', 'j', 'V', 'z', '9491', 'b', 'L', 'X', 'D', 't', 3351, 5113, 9431, 'u', 7355, 3311, 5179, 3705, 'f', 'Q', 8505, 1751, 'c', 6659, 8399, 8671, 'Z', 1227, 'u', 8933, 'K', 'a', 'M'], [637, 1737, 2433, 4225, 5519, 'F', 'D', 5491, 'M', 'r', 3595, 'J', 'b', '2233', 'x', '9715', 'J', 'P', '6451', '9251', 'H', 'h', '3889', 'N', '321', 'r', 'B', 'b', 'e', 'b', '6237', 'N', 'j', 'V', 'z', '9491', 'b', 'L', 'X', 'D', 'z', 5019, 9121, 8195, 6031, 'J', 609, 8163, 'y', 'j', 2653, 'k', 9039, 'N', 'm', 841]