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: NmtypJ, tQtyZD

Answer: ty


Question: bSBuJiZniSlZtO, AcuJiZniSRAOAv

Answer: uJiZniS


Question: KtfcGAZWTXKPPYcTwX, ifkGQGAZWTXKPPjnUqZ

Answer:
GAZWTXKPP