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

SOLUTION: zbgMtdPKs

PROBLEM: kOrQWjLKnwN, xFsWjLKgr

SOLUTION: WjLK

PROBLEM: TlwWhYcsVrxwSikEaFjmwC, ikfIIMWhYcsVrxwSurn

SOLUTION:
WhYcsVrxwS