In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[4385, 'a', 2073, 5621, 'A', 'n', 1919, 1673, 'x', 'v', 'v', 'V', 'h', 'J', '671', '3329', 'b', 'B', 'q', 'f', 'l', '6501', '3425', 'b', '3083', '4541', 'Q', 'p', 'z', 't', 'N', 7057, 'd', 'Y', 'f', 3249, 699, 'x', 1555, 'l', 4749], ['b', 'r', 's', 'v', 'v', 'V', 'h', 'J', '671', '3329', 'b', 'B', 'q', 'f', 'l', '6501', '3425', 'b', '3083', '4541', 'Q', 'p', 'I', 'b', 6909, 'U', 5563, 987]