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

Q: OgWFOfjNYmXVjBBvOdunIc, eGljKGnzFKFOfjNYmXVjdlqsT

A: FOfjNYmXVj
****
Q: CMrTXnTnTVaR, srnXnTnTDNULO

A: XnTnT
****
Q: pkUoQRZZwERzSKgdOgEQ, HnkrDoQRZZwERzhKffQPMjn

A:
oQRZZwERz
****