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

SOLUTION: bi

PROBLEM: mOGzbnDXWnNurkBXtcqZ, NLahGzbnDXWnNYgMTOR

SOLUTION: GzbnDXWnN

PROBLEM: DIkqZszZkUaXDKYTP, FskMaZkUaXDKYznI

SOLUTION:
ZkUaXDKY