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

[Q]: eNuawupVqQ, RIawuplUIf
[A]: awup


[Q]: zqwhMdAdXQfQCAmVNaYZm, toYMIwQeadAdXQfQCAmLyheFOv
[A]: dAdXQfQCAm


[Q]: KduuVOlzYLOZ, SxSBFuVOlzYLdAzw
[A]:
uVOlzYL