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

[Q]: sbQJFbUtmnKaEJePFPeRM, QzfvkdZbUtmnKaEJNrWD
[A]: bUtmnKaEJ


[Q]: bVlwKYBYmcNq, hBlwKYBprL
[A]: lwKYB


[Q]: oGfwLscUeqG, PnLscUaH
[A]:
LscU