In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[9991, 'E', 'e', 8473, 'l', '1879', 'r', '6757', 's', 'G', 3499, 'E', 'C'], [9135, 'u', 'i', 'Q', 'l', '1879', 'r', '6757', 's', 'm', 1881, 5715, 8303]