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

Q: hUpEbyvEcQ, dHpEbyvEvwsXcN

A: pEbyvE
****
Q: rduIwWNGM, AJqYIwWNaCap

A: IwWN
****
Q: fDGnODsM, hzUnGnODTP

A:
GnOD
****