In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['b', 'j', 'u', 6875, 6767, 'w', 87, 5307, 'z', 7377, 9871, 4445, 9855, 'O', 'm', 6217, 8967, 'R', 609, 'j', 6583, '9159', 'd', 'G', 'b', 'G', 'a', 'C', '6281', 'Q', 'J', 'W', '4033', '541', '7163', 'X', 'k', '3131', '447', 'z', 'X', '6635', '1947', 'X', 's', 'L', 'Y', 'K', 677, 'i', 'H', 'B', 8837, 'I', 5439, 2381, 8365, 4793, 4539, 6799, 8645, 5343], ['P', 7419, 8841, '9159', 'd', 'G', 'b', 'G', 'a', 'C', '6281', 'Q', 'J', 'W', '4033', '541', '7163', 'X', 'k', '3131', '447', 'z', 'X', '6635', '1947', 'X', 'm', 'q', 'c', 3235, 1205, 'J', 'y', 4611, 'l', 'x', 4833, 639, 9335, 'z', 'G', 1557, 5303, 'x', 3963, 'J', 3869, 8283]