In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[9883, 6799, 'Y', 's', 'L', 'v', 'F', '4721', '3985', 'w', '675', 'h', 'W', 'G'], [2471, 7263, 'n', 'F', '4721', '3985', 'w', '675', 'h', 'u', 'w']