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

[Q]: TdvkBvVyJcSdYGGPfnyml, rIvIvVyJcSdYhtxG
[A]: vVyJcSdY


[Q]: RNYHvcNnbsUdJLvS, PpNnbsUdglWhl
[A]: NnbsUd


[Q]: DGUIam, eZUIob
[A]:
UI