In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['z', 9175, 3643, 5069, '2877', '6771', 'E', '7203', 'k', 8257, 4261], [7389, 'O', '2877', '6771', 'E', '7203', 'r', 7265, 6271, 8199]