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

Q: andNlOdIcQMyZvc, vCMENolkslOdIcQMyZJtCFo

A: lOdIcQMyZ
****
Q: lLxXqKscqizXTO, TqrKscqizutDudo

A: Kscqiz
****
Q: YGVtLYNlKX, ppDBDVtLYNWIbNc

A:
VtLYN
****