In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

[Q]: zeuyZKwvIOfx, BlmZKwvspUt
[A]: ZKwv


[Q]: BVipiZoGXaWdjmDsxWP, yxppsiYkiZoGXaWdjoDRuKW
[A]: iZoGXaWdj


[Q]: fampYGjQWAaJRJiKHVOSD, ftItvAzuempYGjQWAaJsE
[A]:
mpYGjQWAaJ