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

[Q]: SsshKSaCuNzXzSTgVc, DNNYLWahKSaCuNzXnAjtq
[A]: hKSaCuNzX


[Q]: XWKEpwGRkfCFZGOyZQOoypx, lhQkmVqeRkfCFZGOyugPLqs
[A]: RkfCFZGOy


[Q]: WMWWsVsCRQ, zIWsVsRh
[A]:
WsVs