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

SOLUTION: NCGmJElj

PROBLEM: HXYkGv, GCYksu

SOLUTION: Yk

PROBLEM: pwBwNTtMnlAuDrpZnq, DAREcEayMnlAuDrpXj

SOLUTION:
MnlAuDrp