In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[5243, 'V', 1869, 7241, 'o', '4845', 'L', 'h', 'b', 'C', '4579', 'Q', '2121', '1355', 'U', 's', 'Q'], ['z', 611, 1655, 's', 'o', '4845', 'L', 'h', 'b', 'C', '4579', 'Q', '2121', '1355', 'U', 'z', 2131, 'k', 'u', 1427, 3823, 2055, 5769, 'E', 'I', 'T']