In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['R', 1997, 'k', 's', 'h', '6935', '5315', '8659', 'k', 'G', 'K', 8659, 659, 927, 1479, 4051], [1215, 8733, 'k', 's', 'h', '6935', '5315', '8659', 'k', 'T', 'a']