In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['d', 8957, 'O', 'Q', 6379, 'V', '5753', '9615', 's', 'T', '2155', 'k', 1835], ['n', 'v', 'O', 'Y', 'b', 'V', '5753', '9615', 's', 'T', '2155', 's', 6873, 'H']