In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2273, 'n', 4885, '5261', '9131', 'n', '1351', 'k', 'F', 'u'], ['y', 'R', 3443, '5261', '9131', 'n', '1351', 'P', 's', 5919, 'P']