In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[4693, 'L', 7881, 9637, 'y', 's', 1851, '7315', 'i', 'I', '9393', '79', '279', '4549', '7217', '897', '2329', '5301', '3337', '9273', 'Z', 'a', 5545, 6795], ['t', 'W', 4149, 'h', 'M', 'A', 4569, 2677, '7315', 'i', 'I', '9393', '79', '279', '4549', '7217', '897', '2329', '5301', '3337', '9273', 'r', 2423, 6015, 3755, 6699, 'p', 39, 'h', 'b']