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

JKZiYILNeNQbJyznES, PHKILNeNQbJylltYH
ILNeNQbJy

AedXEOrEgvnzF, TVTEOrEgvxKuJgv
EOrEgv

qkvIwJcJQFx, MVGIwJccr

IwJc