In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2397, 2135, 'k', 5107, 'u', 2821, 8657, 'L', 8839, 2561, 'o', 'E', '6435', 'g', '7087', '9897', 'A', '4577', '9765', '4551', '5081', 'X', 'U', 'I', 'o', '3353', 'R', 'j', '4995', 'Q', 'C', 'z', 'j', 'Q', 'k', 't', 3511, 'S', 'n', 2079, 'G', 'y', 9603, 4409, 511], [9389, 7939, 8653, 1745, 1743, 3401, 6117, 9401, 4593, 'r', 7455, 'H', 'f', 'W', 'e', 'u', 'p', 'o', 'E', '6435', 'g', '7087', '9897', 'A', '4577', '9765', '4551', '5081', 'X', 'U', 'I', 'o', '3353', 'R', 'j', '4995', 'Q', 'C', 'z', 'j', 'Q', 'c', 8387, 6973, 9691, 4091, 'K', 'a', 6089, 9531, 'c', 2835, 'i', 'M', 'x', 'n', 'Q', 'G', 'I', 'n', 7935, 299, 'e']