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

SOLUTION: uJXaSLLPh

PROBLEM: oZZUNCUHtIiauDxQ, OdindZUNCUHtIiLQmWJJf

SOLUTION: ZUNCUHtIi

PROBLEM: jWNGDl, GkNGvU

SOLUTION:
NG