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

lLxXqKscqizXTO, TqrKscqizutDudo
Kscqiz

wlFcxOHoXC, IWFcxOIWTk
FcxO

hMcKYlFh, KpKYlZaK

KYl