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

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


[Q]: yQCDWefwvrPP, RwoMDWefwhSxTR
[A]: DWefw


[Q]: RxAzonuSSOGWnyTv, ecqjmAzonuSSOGdcsBXejxq
[A]:
AzonuSSOG