In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['L', 'q', 'C', 'c', 6507, 'x', 'C', 8247, 2327, 'q', 9785, 'U', 1653, 5189, 1035, 5417, 7385, 3065, 8415, '765', 'D', 'Z', '2235', 'f', '6389', 'e', '4773', 'm', '6621', '1741', '3119', '9893', 'd', 's', '6143', '3079', '4281', 'T', '261', 'H', '7583', 'L', '8421', 'k', 'F', 9173, 'a'], [3971, 6169, '765', 'D', 'Z', '2235', 'f', '6389', 'e', '4773', 'm', '6621', '1741', '3119', '9893', 'd', 's', '6143', '3079', '4281', 'T', '261', 'H', '7583', 'L', '8421', 'H', 'y', 'G', 'a', 'W', 'v', 6451, 4577, 'f', 8945, 'N', 'd', 4649, 'E', 5397, 8145, 'y', 1997, 7353, 'c', 3473, 'k', 'Z', 8131]