In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2449, 'h', 'F', 2217, 'G', 2655, 'k', 'Y', '8427', '2933', 'x', '2689', '9305', 'L', '9263', '2671', 'q', 9553, 4023, 127], [849, 7901, 'd', '8427', '2933', 'x', '2689', '9305', 'L', '9263', '2671', 'r', 'A', 'F']