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

Q: ptVlCwpfOZIi, QEdyVlCwpfOwp

A: VlCwpfO
****
Q: ZhHtTXaUmsQfUMNrnt, KvvebSXaUmsQfBspwM

A: XaUmsQf
****
Q: xTAprIwBwn, IPtFprIwBMcfp

A:
prIwB
****