In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[3513, 5979, 4227, 7273, 5387, 'j', 'k', 7115, 'u', '5847', '1161', '5541', '7519', 'i', 'j', 'a', 'k', '1601', 'j', '4509', 'F', 't', 'W', '977', 't', 7001, 2769, 'a', 'H', 3321, 4351, 'g'], [7881, 'm', 'D', 'u', 6355, 7685, 8853, 't', 'I', 'u', '5847', '1161', '5541', '7519', 'i', 'j', 'a', 'k', '1601', 'j', '4509', 'F', 't', 'W', '977', 'i', 'Q', 'z', 'O', 8021]