In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[8839, 7613, 'x', '7527', 'R', '2941', 'Y', 'o', '8565', 'y', '5121', 'K', 8011, 'B', 'P', 5835, 2827], ['H', 'O', 6529, 't', 8131, 'M', 'd', 1479, 'M', 'x', '7527', 'R', '2941', 'Y', 'o', '8565', 'y', '5121', 'H', 8847, 'n', 8217, 6645, 'v']