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: KKrCLvJKRoyV, WDeLvJKCBdS

Answer: LvJK


Question: AkYuNemHGBEDF, uluNemHGAycbWX

Answer: uNemHG


Question: qcbJBD, EJbJQw

Answer:
bJ