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

Q: ztkWLUJQXxP, fYluOkWLUJKDX

A: kWLUJ
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Q: JjEQVKijeyEQ, dwSVKijeywCTvb

A: VKijey
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Q: lOuQTyoJFaXnjJXPyDNh, APTyoJFaXnjOAfxRZF

A:
TyoJFaXnj
****