In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['y', 'q', 'a', 'k', '1971', 'x', '3735', '6911', '6385', '2563', 'u', '3011', 'W', 'E', 'Y', '6579', 'd', '7175', 'Q', 'F', 'a', 'H', 833, 'l', 4577, 'v', 2981, 2755, 5959, 7131, 'u', 'V'], ['Y', 'E', 'Z', 2577, 'M', 'U', 8435, 'r', 9471, 8091, 'M', 7465, 1607, 'X', 1199, 8679, 'k', '1971', 'x', '3735', '6911', '6385', '2563', 'u', '3011', 'W', 'E', 'Y', '6579', 'd', '7175', 'Q', 'D', 'r', 'g', 6103, 7631, 'a', 8551, 3497, 8251, 'c', 'R', 'R', 8439, 'B']