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

Q: YPeBvuJXaSLLPhKpUQ, ryjPdyuJXaSLLPhIzBeJP

A: uJXaSLLPh
****
Q: VRamNL, mUamIB

A: am
****
Q: UDehiMlcgrmZcH, UFMlcgrrUhkm

A:
Mlcgr
****