In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[4893, 7559, 'U', 6255, 'v', 'c', 263, 'v', 'Y', 'v', 'N', 'p', '9481', '357', 'r', 'K', 'n', '3099', 'x', 8143, 'H', 4449, 1465, 'i', 2563], [3893, 'M', 't', 'S', 7755, 5001, 'D', 1451, 9465, 'Y', 'v', 'N', 'p', '9481', '357', 'r', 'K', 'n', '3099', 'I', 7951, 6687, 2733, 'O']