In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[3879, 7551, 8425, 8047, 'U', 'X', 8143, 7987, '4047', 'L', 'i', '3115', 'B', 'i', '4317', '4469', 'j', '533', '9715', '485', 'K', 'u', 'Y', 'd', 's', '5685', '6761', '5235', 'R', 'N', 'D', 'b', '5487', 'Q', 'U', 'V', 'l', 'x', 5605, 8007], ['y', 4289, 'Q', 3007, 4895, 8789, '4047', 'L', 'i', '3115', 'B', 'i', '4317', '4469', 'j', '533', '9715', '485', 'K', 'u', 'Y', 'd', 's', '5685', '6761', '5235', 'R', 'N', 'D', 'b', '5487', 'Q', 'U', 'V', 'O', 1203, 7151, 279, 4563, 1369, 321, 2979, 1101, 'n', 9581, 'u', 'z', 'i', 985, 'F', 1221, 2597, 3873, 'W', 'B', 'Y', 4955, 6545, 1547]