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

[Q]: zqwhMdAdXQfQCAmVNaYZm, toYMIwQeadAdXQfQCAmLyheFOv
[A]: dAdXQfQCAm


[Q]: cUCQXEFSgRZjK, RYdvUQXEFSgRZVlwx
[A]: QXEFSgRZ


[Q]: KlVOqgrzuQY, mOOqgrPH
[A]:
Oqgr