In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['C', 'b', 'r', 'C', 'u', 6845, 5651, 7645, 'R', 807, 'P', 'k', 'a', 'N', 3563, 5799, 2751, 6979, 3599, 'u', 6551, 'k', 2851, 2799, 6821, 5517, 5881, '4069', 'W', '5773', '8391', 'G', 'g', 'b', '7281', '1379', '7875', 'h', '49', '9771', 'n', 'T', '5191', '2261', '3923', 'j', '4435', '1323', '713', '1623', '1877', '6243', '2247', 'l', 'l', 'X', 'q', 'J', 'e', 'Z', 4907, 9717, 'E', 'Z'], [7995, 'c', 9787, 3295, '4069', 'W', '5773', '8391', 'G', 'g', 'b', '7281', '1379', '7875', 'h', '49', '9771', 'n', 'T', '5191', '2261', '3923', 'j', '4435', '1323', '713', '1623', '1877', '6243', '2247', 'l', 'l', 'm', 'm', 'q', 2477, 'e', 7309, 'b', 1853, 7103, 'N', 'w', 'Y', 'K', 3613, 'g', 7831, 9831, 'Y', 7689, 4621]