In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['Y', 5059, 's', 'h', '6151', '3475', '3473', '8585', 'L', 'F', 8209, 'V', 9127], [6489, 1639, 'L', '6151', '3475', '3473', '8585', 'L', 'Z', 3243, 2577, 'I']