In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['D', 8917, 'S', 't', '8983', 'e', 'y', 'O', 'U', 's', 'e'], [6911, 'K', 'S', 't', '8983', 'e', 'y', 'w', 'e', 7377, 'P']