In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[323, 'K', 'g', 'R', 'H', 'U', 7115, 'c', '3887', 'D', '5417', 'f', '3301', '955', 'l', 'b', 2909, 4121, 7353, 4595, 5693], ['y', 8691, 8223, 'c', '3887', 'D', '5417', 'f', '3301', '955', 'l', 'k', 5961, 'N', 'g', 4701, 3213, 'W']