In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[3953, 2633, 'F', 'W', 'B', 7669, 23, 'p', 8839, 'l', 2175, 4571, 2681, 'C', 'u', 'm', '9989', 'u', '7377', '7125', 'V', 'J', '4849', '7853', '2837', '8773', '8193', '6725', '5493', 'z', 'K', 725], ['y', 7651, 5379, 'e', 'F', 2099, 't', 4593, 'l', 5799, 'u', 'U', 2617, 1097, 'C', 'u', 'm', '9989', 'u', '7377', '7125', 'V', 'J', '4849', '7853', '2837', '8773', '8193', '6725', '5493', 'b', 's', 2293, 'R', 8889, 'P', 'V', 'G', 'k', 'W', 9609, 7895]