In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[7631, 6431, 1955, 9537, 'n', 'K', '9461', 'y', 'U', 'B', 'T', '4837', '7803', 'A', 'o', 4949], [3437, 6423, 2465, 5937, 'K', '9461', 'y', 'U', 'B', 'T', '4837', '7803', 'A', 'l', 'f', 5147, 'h', 4827, 8223]