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

[Q]: zeuyZKwvIOfx, BlmZKwvspUt
[A]: ZKwv


[Q]: SFQHJlK, dHfQHJoUC
[A]: QHJ


[Q]: dZJWBGoeoMepPoTg, pekBGoeoMeQP
[A]:
BGoeoMe