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

SOLUTION: RGKkpALcKd

PROBLEM: yrIDSuVuQU, UXTSuVuLcch

SOLUTION: SuVu

PROBLEM: JgpYfxPVDuosylIcN, QpCYfxPVDuiw

SOLUTION:
YfxPVDu