In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[4273, 5275, '9693', '9949', '2189', '4053', 'l', '3955', 'v', 4093, 5693, 'f', 'e'], [7887, 'R', 'p', '9693', '9949', '2189', '4053', 'l', '3955', 'Z', 8577]