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

SOLUTION: lwKYB

PROBLEM: JqdTDnZqSuSVcMsx, TEtDDnZqSuZa

SOLUTION: DnZqSu

PROBLEM: SFQHJlK, dHfQHJoUC

SOLUTION:
QHJ