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

Q: kUoqCMPFTqGE, guoqCMPkwJs

A: oqCMP
****
Q: oCtWZYdkvZ, pkktWZYdEHMW

A: tWZYd
****
Q: uxnltveNQzRnCvc, EdniveNQzRnxihEPd

A:
veNQzRn
****