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

[Q]: ATmVEtUuZOgsBUuL, UMUuZOgsBPVT
[A]: UuZOgsB


[Q]: apGMPThLTCw, LvMPThYW
[A]: MPTh


[Q]: rAFshlTadvaNjuJ, VtkHalTadvaNxIoN
[A]:
lTadvaN