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

[Q]: feYKRk, PrYKMW
[A]: YK


[Q]: txJhzNeBj, qLJhzNesV
[A]: JhzNe


[Q]: FKPXwrdczSUxNiHmexB, SZupZojXwrdczSUxtaBY
[A]:
XwrdczSUx