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

[Q]: YCAyruPTTHWhCYaiXfIl, OETdzqAyruPTTHWgS
[A]: AyruPTTHW


[Q]: OXdSmcKG, XbDdSmJl
[A]: dSm


[Q]: OgWFOfjNYmXVjBBvOdunIc, eGljKGnzFKFOfjNYmXVjdlqsT
[A]:
FOfjNYmXVj