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: ljwjMioOwfOltGBaE, TneNGsoOwfOlxnWWW

Answer: oOwfOl


Question: qQkmYsYN, UhkmYHSy

Answer: kmY


Question: UkrvTvGWkEGH, NfvGWkEucFrw

Answer:
vGWkE