In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['H', 'x', 1845, 'E', 6301, 'I', 'u', 3889, '9839', 'X', 'b', 'g', '3117', 'F', '7211', 'T', 'X', '5329', '4821', 'j', 5467, 2581], [7363, 'f', 481, 'n', 'O', 'k', 1761, 'c', 'm', '9839', 'X', 'b', 'g', '3117', 'F', '7211', 'T', 'X', '5329', '4821', 'i', 1457, 1067, 7005, 6445, 2175, 1721]