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

Q: TdvkBvVyJcSdYGGPfnyml, rIvIvVyJcSdYhtxG

A: vVyJcSdY
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Q: wXGerDNhSNnCCedyzskswVnh, BfFNhSNnCCedybrUbI

A: NhSNnCCedy
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Q: gqKRBziAHCIwmnHXqxDa, XhhzziAHCIwmnHtUO

A:
ziAHCIwmnH
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