In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['B', 's', 'q', 9813, 'H', '8453', 'J', '9671', '1759', 'u', 'j', 'Y'], [31, 'T', 'z', '8453', 'J', '9671', '1759', 'u', 'b', 'T']