In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['b', 2159, 'B', 'h', 'r', 'i', '4693', 'S', 'j', 'l', '2013', 'L', 'I', 'E', 'u'], ['V', 'e', 'f', 'G', 5793, 'N', 3957, 'B', 'h', 'r', 'i', '4693', 'S', 'j', 'l', '2013', 'L', 'L', 'f', 8199, 'g', 'U', 4081, 4381, 8249, 2159, 'O']