In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['C', 2499, 6769, 'I', 'k', '3835', '217', '937', '941', 'a', 'f', '4513', '4825', 'R', 'w', 'r', 7325, 627, 'L', 'E', 4829], ['X', 'J', 701, 'k', '3835', '217', '937', '941', 'a', 'f', '4513', '4825', 'R', 'w', 'R', 'h', 'x', 4261, 9733, 2933, 'b', 4601, 'n', 'S', 3233]