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

[Q]: CwTYJWQbzEZkvcqKn, hBnhJWQbzEZkKmVM
[A]: JWQbzEZk


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


[Q]: VXSNlHzkB, EoNlHCiL
[A]:
NlH