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

SOLUTION: SN

PROBLEM: NTINFnRckGsfLqhSoA, UUONcKKFnRckGsfLqVak

SOLUTION: FnRckGsfLq

PROBLEM: eKhHpCBgp, FoHpCBTUK

SOLUTION:
HpCB