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

SOLUTION: zNuZh

PROBLEM: OUNqomxFcLXhWdfB, gdqomxFcLHQPCu

SOLUTION: qomxFcL

PROBLEM: uHXOlJXMShUAqZcFUCmmgTXgf, bJcAKSMShUAqZcFdF

SOLUTION:
MShUAqZcF