In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[6897, 315, 'e', 'a', 7289, 'X', 597, 7939, 'r', 5337, 3441, '2265', '3071', '7899', 'T', 'V', '9819', '3399', '1143', '267', '7909', '2683', 'J', 4559, 5821, 4345, 'b'], ['r', 4453, 'q', 'q', 'm', 'r', 8119, '2265', '3071', '7899', 'T', 'V', '9819', '3399', '1143', '267', '7909', '2683', 'T', 2433, 113, 'q', 1907, 'G', 'b']