In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['C', 'u', 'i', 951, 2801, 4921, 'H', 'X', 'D', 2271, 2089, 'e', 'J', 'N', 2959, 'W', '2373', 'u', 'c', '2647', 'W', '4825', 'm', 'C', '3571', '1415', 'v', '9993', '8353', 'Q', '6097', '9935', 'd', '6541', 'i', '593', 'E', 'T', '1967', '5017', 'Z', 1407, 'W', 'Z', 8509, 'A', 5445, 'f', 'V', 'L', 'P', 3909, 1039, 'I', 3609, 'g', 'm', 2883, 3295], [173, 4757, 'C', 'U', 'J', 'x', 593, 'Z', 'P', 3401, 'C', 3419, 'h', 'i', '2373', 'u', 'c', '2647', 'W', '4825', 'm', 'C', '3571', '1415', 'v', '9993', '8353', 'Q', '6097', '9935', 'd', '6541', 'i', '593', 'E', 'T', '1967', '5017', 'X', 'W', 6693, 8075, 'b', 663, 'D', 'n', 2893, 6455, 'k', 5249, 'g']