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

SOLUTION: iZoGXaWdj

PROBLEM: biAihydBoNlzR, IAloNhydBolwUz

SOLUTION: hydBo

PROBLEM: WGkETjNn, ftkETRyK

SOLUTION:
kET