In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[3443, 9923, 'A', 'B', 'G', 'L', '2807', 'L', 'v'], ['h', 'i', 'A', 'B', 'G', 'L', '2807', 'r', 1197, 'u', 655, 521]