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

[Q]: kvutZfcPKzHE, kTKutZfcPTGmU
[A]: utZfcP


[Q]: nhGinCtvLartcMPhJwGRbpZNrq, iQJlFKayEartcMPhJwDRROB
[A]: artcMPhJw


[Q]: vHrllOYRwMMxzdQTeF, APxHJGElOYRwMMZq
[A]:
lOYRwMM


