In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[3391, 8549, 'G', 1657, 'I', 'n', '2085', 'J', '5715', 'V', 'f', 'l', 'W', 'M', 'N', 5913, 'e', 197, 'j', 't', 'W'], ['M', 3669, 'Y', 'g', 'o', 'd', 's', 'n', '2085', 'J', '5715', 'V', 'f', 'l', 'W', 'M', 'Q', 'J', 1725, 'G', 'w']