In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['x', 't', 'O', '5429', 'U', '9553', '9245', 'I', 'N', 'k', '6725', '1369', '6903', 'f', 4143, 'q', 5887, 3793], ['f', 7931, 'I', 'H', '5429', 'U', '9553', '9245', 'I', 'N', 'k', '6725', '1369', '6903', 'd', 2101, 8179, 'Q', 3153, 9689, 'N']