TASK DEFINITION: In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
PROBLEM: wlFcxOHoXC, IWFcxOIWTk

SOLUTION: FcxO

PROBLEM: sJRFPufsaWXNeu, AePufsafc

SOLUTION: Pufsa

PROBLEM: sNZOZg, GrZORz

SOLUTION:
ZO