In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[8123, 6481, 3485, 'b', '1255', 'Q', 'K', 'x', '9251', '9449', '6495', '7439', 'N', 'J', '4513', 'Y', 'x', '7227', 'Y', 9845, 8491, 's', 2197, 9505, 'P'], ['J', 3297, '1255', 'Q', 'K', 'x', '9251', '9449', '6495', '7439', 'N', 'J', '4513', 'Y', 'x', '7227', 'q', 'K', 'N', 73]