In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['X', 'm', 'n', 'b', 4993, 2539, 'T', 'E', 'i', 'R', 't', 'b', 'I', 'n', '8955', '6315', '7509', 'm', 2705, 2113, 'N', 'O'], ['K', 7231, 3643, 2773, 'p', 'i', 'R', 't', 'b', 'I', 'n', '8955', '6315', '7509', 'Y', 'E', 883, 'h', 5881, 'l']