In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['W', 'A', 4297, 'E', 3387, '865', '6255', 'Q', 'y', 'c', 'b', 's', '8699', '8951', 'J', 9251, 'P', 6403, 3871, 'X', 1101], [8331, 'A', 8533, 8119, 8719, 8133, 'D', 'N', 6661, '865', '6255', 'Q', 'y', 'c', 'b', 's', '8699', '8951', 'I', 7949, 'X', 6325, 2651, 'b', 'r', 1975, 5281]