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

[Q]: oWwqraAz, uxTqraonu
[A]: qra


[Q]: bUcuzFgsdfojVR, IdcuzFgsdMRgtMA
[A]: cuzFgsd


[Q]: cCJPFSxY, wHPFSaDo
[A]:
PFS