In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
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Question: osmJJcZlDAXBgJFsJKa, rzPNlDAXBgJYrgXlH

Answer: lDAXBgJ


Question: KKebLWQCQzVIojj, nxQCQzVIopD

Answer: QCQzVIo


Question: zBeQKDsTcFz, qbaQKDsTUOkG

Answer:
QKDsT