In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['M', 7815, '3947', 'D', 'K', '4927', 'j', 'b', '639', '2493', 'D', 4307], [6457, 'u', 'L', 3071, 7569, '3947', 'D', 'K', '4927', 'j', 'b', '639', '2493', 'P', 4463, 'T', 'F', 'j']