In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['e', 'c', 'E', 'd', 'D', 'L', 'h', 'k', 'P', '3951', 'R', 'U', 'Y', 'h', 'r', 2881, 'O'], [1491, 1123, 'h', 'k', 'P', '3951', 'R', 'U', 447, 'V', 'A', 3357]