In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[4839, 2307, '5609', 'V', 's', '7059', 'N', '3761', 'i', '161', '1987', 'N', 'J', 'h', 'k', 'P'], [2615, 't', 5171, 'V', 'q', '5609', 'V', 's', '7059', 'N', '3761', 'i', '161', '1987', 'N', 'p', 5261, 3251]