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

[Q]: CwTYJWQbzEZkvcqKn, hBnhJWQbzEZkKmVM
[A]: JWQbzEZk


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


[Q]: rZPuJjW, INPuJJOB
[A]:
PuJ