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: eNuawupVqQ, RIawuplUIf

Answer: awup


Question: UCbReSfuLcbzmBCl, snQRReSfuLcbzmjqVPSdpp

Answer: ReSfuLcbzm


Question: xBRldOlu, RbfldOqZ

Answer:
ldO