In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['l', 'd', 1949, 'n', 8499, 'q', 9403, '5873', '9393', 'o', '7913', '4679', 'q', '6049', 'n', 'x', 'y', 4615, 2845, 3245], ['D', 'x', '5873', '9393', 'o', '7913', '4679', 'q', '6049', 'n', 'x', 'X', 8255, 'c', 'b', 8511, 6449, 9607, 2285, 1801]