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

SOLUTION: lBjKv

PROBLEM: OVZxWYzAAxG, rStOxWYzJeoC

SOLUTION: xWYz

PROBLEM: wwxgSPrJmZmMJMvhlEbNPrsYmUl, XbNwZmMJMvhlEbhz

SOLUTION:
ZmMJMvhlEb