In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[4125, 6663, 'w', 6681, 'o', '3437', 'm', 'E', '5669', '2679', 'u', 'f', '1391', 'n', 'S', 'j', 'H', 'x', 'R', 'X', 7919, 'C', 6547, 'e'], ['T', 737, 6165, 'm', 'x', '3437', 'm', 'E', '5669', '2679', 'u', 'f', '1391', 'n', 'S', 'T', 'M', 'U', 8697, 'D']