In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['C', 'c', 'b', 'a', 6437, 2291, 'C', 'L', 393, 'A', 3427, 'g', 5771, 'J', 'U', 'A', 'J', 'b', '7047', 'D', 'y', '2329', '6063', '2319', 'p', 'x', 'c', 'O', '6915', 'M', 's', 'K', 't'], ['W', 'U', 2961, 'J', 'U', 'A', 'J', 'b', '7047', 'D', 'y', '2329', '6063', '2319', 'p', 'x', 'c', 'O', '6915', 'M', 's', 'V', 6663, 3623, 'Z', 2129, 771, 3213]