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

SOLUTION: NgaUu

PROBLEM: iYuUgULgqcAgd, kRNUgULgqFv

SOLUTION: UgULgq

PROBLEM: UovaYpHjYSQzrfsxRfvIZE, pUOFxIKOGQzrfsxRfvIjrza

SOLUTION:
QzrfsxRfvI