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

SOLUTION: oR

PROBLEM: yITbYie, TlqTbYomH

SOLUTION: TbY

PROBLEM: vujACgAOrRFJJM, bEjACgAOkvY

SOLUTION:
jACgAO

