In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[3857, 8205, 'z', 'k', 'W', 'V', 'i', 'T', 'Y', '2749', '9847', 'a', 'R', 'j', 'U', 'c', 6185, 'P'], ['F', 9777, 'F', 'J', 'i', 'T', 'Y', '2749', '9847', 'a', 'R', 'j', 'U', 'C', 't']