In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['i', 669, 'b', 'T', 9109, 'S', 'J', '193', 'M', 'y', '1091', '2543', '5811', '5675', 'Q', '1623', 'L', '7135', '3885', '7373', 'b', 'R', '431', 'Z', '8469', 'p', 'G', 'h', 'm', 8469, 3475, 4771, 2459, 'S', 9957, 'p', 'x', 8837, 5847, 8981, 5581, 7823, 'S'], [2715, 'n', 'F', 'f', 5793, 'P', 2253, 7819, 'v', 'W', 'S', 'J', '193', 'M', 'y', '1091', '2543', '5811', '5675', 'Q', '1623', 'L', '7135', '3885', '7373', 'b', 'R', '431', 'Z', '8469', 'p', 'G', 'm', 'G', 1499, 5835, 'u', 5019, 1703, 8221, 'q']