In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[7713, 'a', 'V', 'M', '3563', '9555', 'l', 'Q', 9107, 6971], [1921, 'O', 'z', 'V', 'M', '3563', '9555', 'J', 4699]