In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['M', 833, 'r', '2699', '8645', 'e', 'R', '2181', 'G', 'X', 'O'], ['D', 'n', 2171, '2699', '8645', 'e', 'R', '2181', 'G', 'Z', 'c', 'Q', 1689, 'A', 'F']