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

SOLUTION: LvJK

PROBLEM: HaLZdTX, tLLZdEXN

SOLUTION: LZd

PROBLEM: tGTtXDAOvyIOM, noDAOvyLp

SOLUTION:
DAOvy