In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['K', 4691, 'I', '2495', '1015', 'L', '581', 'b', 9477], ['k', 2419, 'd', 'I', '2495', '1015', 'L', '581', 'r', 's', 6673, 5755]