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

SOLUTION: IwWN

PROBLEM: yITbYie, TlqTbYomH

SOLUTION: TbY

PROBLEM: umONWy, kWONpe

SOLUTION:
ON