In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['r', 'g', '997', 'n', '631', '527', 'E', 'A', 'n', 'n', 'G', '1197', 'R', 'L', 'G', 'N', 2585], ['X', 5347, 'M', 'Z', 4615, '997', 'n', '631', '527', 'E', 'A', 'n', 'n', 'G', '1197', 'R', 'L', 'P', 'o']