In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[4703, 'U', 'q', '7411', 'c', '5993', '9709', '5045', 'k', 'L', 229, 985], [6703, 'u', 9665, 8741, 7985, 9561, 'q', '7411', 'c', '5993', '9709', '5045', 'G', 4381, 'K', 'B', 'T']