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

SOLUTION: GPQVPrqP

PROBLEM: txJhzNeBj, qLJhzNesV

SOLUTION: JhzNe

PROBLEM: ZbGGjzcFvHhdRewTxqD, VqccGjzcFvHhkVYDkc

SOLUTION:
GjzcFvHh

