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

SOLUTION: rAxJfVhP

PROBLEM: bVlwKYBYmcNq, hBlwKYBprL

SOLUTION: lwKYB

PROBLEM: HsSnDc, xVSnqf

SOLUTION:
Sn