In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['P', 345, 485, '6459', 'H', '6117', '9595', 'n', 'l', 'r', 5969], ['C', 'Q', 'J', 2789, '6459', 'H', '6117', '9595', 'n', 't', 5463, 'u']