In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[6999, 9137, 3989, 't', 6663, 'O', 'g', 609, 3685, 8769, 7073, 'M', 'K', 's', '2211', 'o', 't', 'd', '7393', 'u', '8147', 'd', '6345', '2145', '9185', 'k', 'J', '2221', 'i', 9591, 85, 3139, 5217, 'T', 's', 9785, 1367, 8501, 'n', 1657], ['A', 'E', 4807, 'C', 'f', 3377, 'c', 409, 'J', 8247, 'v', 'M', 'K', 's', '2211', 'o', 't', 'd', '7393', 'u', '8147', 'd', '6345', '2145', '9185', 'k', 'J', '2221', 'P', 'p', 681, 2213, 'C', 'S', 1517, 'n', 'F', 'C', 'R', 'T', 'G', 'x', 6291, 1775, 'O']