In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[6609, 913, 'p', 'q', 'y', 2753, 5865, '693', '3587', '9637', '7713', 'Y', '7685', 'G', '2953', '9447', 'F', 'A', '3439', '4549', 'm', '703', '7101', 'r', '9971', 'U', '5685', '7903', 'U', 'z', 'h', '2673', '1841', '6151', 'U', '6783', 'u', 3561, 2857, 3763], [4575, 'X', '693', '3587', '9637', '7713', 'Y', '7685', 'G', '2953', '9447', 'F', 'A', '3439', '4549', 'm', '703', '7101', 'r', '9971', 'U', '5685', '7903', 'U', 'z', 'h', '2673', '1841', '6151', 'U', '6783', 'U', 217, 9441, 'W', 'Q', 'x', 'N', 'm', 'c', 8627, 2441, 'Y', 'V', 9387, 'u', 7789, 'M', 7551, 3941, 'p']