In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[4291, 5209, 229, 6545, '3629', 'q', 'f', 'H', '3447', '5459', '725', '7967', '2807', 'l', 6101, 7389], [8323, 4629, 'M', 'U', '3629', 'q', 'f', 'H', '3447', '5459', '725', '7967', '2807', 'S', 'y', 723, 687]