In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['d', 10021, 8031, 9611, 9407, 'k', 'z', '2015', 'C', '3207', 'K', 't'], [6823, 5767, 's', 'k', 'z', '2015', 'C', '3207', 'D', 197, 'q', 'f', 'z']