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

SOLUTION: ZzZL

PROBLEM: FNVeaFmprNHqqtAaKv, iGBmrrMveaFmprNHqWWAvtht

SOLUTION: eaFmprNHq

PROBLEM: OmQctmlQRaYCgCgORplVrgz, PlgrAVxRaYCgCgORmRVa

SOLUTION:
RaYCgCgOR