In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[7603, 2475, 'H', 263, 't', '2289', '2931', 'y', '9481', '7559', '4641', '2839', '6791', '2919', 'p', 'J', '1965', 'T', '2307', '6059', '1789', '2135', 'v', '5727', '5359', '7789', 'B', 3303, 4319, 8747, 'k', 6767, 'F', 'r', 'M', 7787, 915, 1955, 'H', 'z', 7517, 'o', 'b', 'B', 7543, 1209, 1591], [9803, 6889, 8447, 3579, 5225, 1081, 'n', 'x', 'U', 'G', 5221, 5971, 1839, 't', '2289', '2931', 'y', '9481', '7559', '4641', '2839', '6791', '2919', 'p', 'J', '1965', 'T', '2307', '6059', '1789', '2135', 'v', '5727', '5359', '7789', 'C', 3927, 'T', 8921, 'J', 8119, 'o', 'a', 6557, 'n', 'J', 'z', 'e', 'u', 4923, 'e', 1791, 451, 8071, 4001, 'u', 'u']