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

Q: nhGinCtvLartcMPhJwGRbpZNrq, iQJlFKayEartcMPhJwDRROB

A: artcMPhJw
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Q: nFgMXUzpStDAybiwm, aNJrXUzpStDjp

A: XUzpStD
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Q: MfdcvqWGUzWoTyxtEGoNjGat, CXABJSvuqvqWGUzWoTyQfkrtJu

A:
vqWGUzWoTy
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