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

[Q]: UovaYpHjYSQzrfsxRfvIZE, pUOFxIKOGQzrfsxRfvIjrza
[A]: QzrfsxRfvI


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


[Q]: CgsGzzcmJkp, BATQOcsGzzcmCFasoP
[A]:
sGzzcm