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

Q: ZhHtTXaUmsQfUMNrnt, KvvebSXaUmsQfBspwM

A: XaUmsQf
****
Q: bUcuzFgsdfojVR, IdcuzFgsdMRgtMA

A: cuzFgsd
****
Q: YdSsNBnhcacpDmBoVDeU, wWtxhYuinhcacpDmBopqLumeDWy

A:
nhcacpDmBo
****