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

SsshKSaCuNzXzSTgVc, DNNYLWahKSaCuNzXnAjtq
hKSaCuNzX

iYSNsY, HSSNhP
SN

IszCRwmIQfSquPv, NOWqFCRwmIQOxJr

CRwmIQ