In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[3819, 2273, 'l', 9611, 'r', 'B', '2849', 'O', '2033', 'Q', '7003', 'l', 'J', 8911, 'v'], ['U', 'T', 'z', '2849', 'O', '2033', 'Q', '7003', 'l', 'U', 'q', 495, 1637, 'U']