In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['K', 'q', 'Q', 'b', 961, 'x', 9713, 'f', 'a', 'I', 'M', '519', '6565', '2981', '9639', 'Y', '2453', '1645', 'p', 'U', '5539', '351', '6001', 'a', 'q', 'o', 'L', 'R', 'X', 9229, 729, 5573, 5607, 7157, 'Y', 2273, 5681], ['q', 'f', 9311, 'i', 'a', 'I', 'M', '519', '6565', '2981', '9639', 'Y', '2453', '1645', 'p', 'U', '5539', '351', '6001', 'a', 'S', 'l', 'W', 8195, 'b', 'x', 3553, 7033, 9409, 'v']