In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

Q: uGDJixAmSiVaFRmfKRM, NsTGxsJixAmSiVageSw

A: JixAmSiVa
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Q: JzbEpAquDJFKcNvEWZxVqRV, PFiJlpAquDJFKcNcqOpMeAv

A: pAquDJFKcN
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Q: TLzYOkFCw, XjRYOkgA

A:
YOk
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