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

[Q]: jinzsW, SMnzaW
[A]: nz


[Q]: kyADtWLlnmYv, tcaKvDtWLlnvBq
[A]: DtWLln


[Q]: kqpVVVHYRIrtD, xsIVVHYRIroAoBfcL
[A]:
VVHYRIr