In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['W', 3275, 'v', 5241, '8021', '2841', '9363', '9397', 'Z', 'm', 4961], [4721, 'r', 'H', 'f', '8021', '2841', '9363', '9397', 'Z', 'q', 'l', 6293, 'R', 'Q']