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: Owbiay, exbime

SOLUTION: bi

PROBLEM: MYXqJReeyXfTH, wlhReeyXBFiQB

SOLUTION:
ReeyX