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: hUpEbyvEcQ, dHpEbyvEvwsXcN

Answer: pEbyvE


Question: tftBHoDOYxCoTHVf, qhHoDOYxfUU

Answer: HoDOYx


Question: mYXTGdt, dZXTGtt

Answer:
XTG