In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['N', 3679, '5181', 'q', 'c', 'W', 'r', 'l', 399], ['f', 6419, 5567, 'L', 'c', '5181', 'q', 'c', 'W', 'r', 'd', 8123, 3981, 'D', 'W']