In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[7237, 5011, 7385, 8711, 'x', 'x', 'V', '2431', 'f', '579', 'a', '2663', '2605', 'k', '4607', '517', 'v', '1441', 'r', '1729', '4445', 'i', 'y', '2727', 'U', '8423', 'k', '8035', '9413', '723', '8519', 'P', 's', '1885', 'm', 'i', 'Z', 'k', 4667, 'F', 'C', 'Y', 's', 69, 855, 1193, 6997, 8759, 2463, 7389, 9513, 963], ['s', 'f', 8079, 'U', 2925, 4973, 9737, 9171, 6619, 'y', 8543, 7715, 7943, 'Z', 9351, 4425, 5381, 8181, 6865, 'j', 'V', '2431', 'f', '579', 'a', '2663', '2605', 'k', '4607', '517', 'v', '1441', 'r', '1729', '4445', 'i', 'y', '2727', 'U', '8423', 'k', '8035', '9413', '723', '8519', 'P', 's', '1885', 'e', 's', 'S', 7169, 7891, 1261, 4119, 'b', 'W', 6817, 7715, 'r']