In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[963, 1005, 'd', 3639, 'D', 6109, 'P', '3555', '935', 'V', 'y', 'v', 'C', 'A', 'D', '8401', 'k', 'B', 'L', 6439, 'W', 's', 'r'], ['V', 2583, 'p', '3555', '935', 'V', 'y', 'v', 'C', 'A', 'D', '8401', 'k', 'S', 'f', 'T', 'M', 2503, 5471, 'B', 3691, 7957]