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

SOLUTION: Lyg

PROBLEM: KJswoapnXz, EQswoaFyH

SOLUTION: swoa

PROBLEM: BXAFzHbdiAUTjmQxxsMImk, WqLpKsXfAUTjmQxxsZG

SOLUTION:
AUTjmQxxs