In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[6631, 6455, 4457, 'j', 'w', '8271', '1323', '7619', 'D', 'y', '9121', 'A', '7085', '8661', '7155', 'z', '4887', 'K', 's', 'V', '8253', '6335', '9991', 'v', '477', '2007', 'n', '963', '4595', '765', '7011', 'W', 'h', 5621, 'W', 'F', 'x', 'o'], [2805, 'I', 'z', 'X', 'c', 'w', 8349, 'U', 'c', 7957, 'q', 6801, 'J', 'C', 'j', 3683, 8209, 891, 'm', 'H', 'r', 's', 'a', 'M', 8239, '8271', '1323', '7619', 'D', 'y', '9121', 'A', '7085', '8661', '7155', 'z', '4887', 'K', 's', 'V', '8253', '6335', '9991', 'v', '477', '2007', 'n', '963', '4595', '765', '7011', 'W', 'W', 851, 8983, 'Q', 'h', 'B']