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

Q: jsXHot, gtXHmB

A: XH
****
Q: OUNqomxFcLXhWdfB, gdqomxFcLHQPCu

A: qomxFcL
****
Q: bZVHfgaHIJDnTebUQSMWg, uodHIJDnTebKH

A:
HIJDnTeb
****