In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['B', 'R', 't', 't', 'A', 'z', 9785, 3575, 'o', 'u', 5087, 'L', '1781', 'V', '8559', '911', 'F', 'I', 'O', '2163', 'O', 'q', 'c', 'h', 'y', 'O', 'z', 'L', 7885, 's', 5219], ['y', 'k', 1719, 'L', 'f', 'I', 'u', 4839, 'L', '1781', 'V', '8559', '911', 'F', 'I', 'O', '2163', 'O', 'q', 'c', 'h', 'y', 'F', 'z', 'O', 'e', 'K', 'x']