In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[7321, 131, 'a', 'L', 'v', 7871, 'I', 'Y', 'Q', 'N', '8977', '6205', '2393', '899', '2271', '2869', 'T', 'B', 'M', '5621', 'y', 'O', 'y', 7453, 'Q', 'm', 7289, 'I', 'c', 2203], [6959, 'F', 'C', 3715, 9407, 9585, 'K', 'Z', 6135, 'N', 'F', 1031, 961, 'O', 'B', 'Y', 'Q', 'N', '8977', '6205', '2393', '899', '2271', '2869', 'T', 'B', 'M', '5621', 'y', 'O', 'G', 979, 3697, 'c', 't']