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]: tftBHoDOYxCoTHVf, qhHoDOYxfUU
[A]: HoDOYx


[Q]: FSwxBJ, iTwxAa
[A]:
wx