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

[Q]: BdqUloJanutXoOyfLsuA, NRDloJanutXoOQY
[A]: loJanutXoO


[Q]: XSnVeAjWLFWTgwmf, WsByLAjWLFWnQfl
[A]: AjWLFW


[Q]: icrKUrfOwIgIGf, XjjKrKUrfOKr
[A]:
rKUrfO