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

[Q]: UvYbfKFybXofcwLRrLRiK, BgMZKFybXofcVe
[A]: KFybXofc


[Q]: mOGzbnDXWnNurkBXtcqZ, NLahGzbnDXWnNYgMTOR
[A]: GzbnDXWnN


[Q]: ZddHZeFIQm, QlydHZeFIaOowc
[A]:
dHZeFI