In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['Q', 'E', 7903, 7295, 8255, 'x', 'X', 'E', 'B', '9393', '3597', 'k', '5503', 'y', '3557', 'K', '4497', 'L', 'P', '8905', 'E', 'X', 'S', 'b'], ['m', 'l', 'j', 'y', 'H', 3955, 2889, 'C', 'H', 3313, 's', 'c', 'w', '9393', '3597', 'k', '5503', 'y', '3557', 'K', '4497', 'L', 'P', '8905', 'E', 'X', 'q', 6457]