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

[Q]: YHLJZrFQ, aSLJZQuo
[A]: LJZ


[Q]: DnAzbgMtdPKsNCMpBfc, QdfXRkWREzbgMtdPKsGx
[A]: zbgMtdPKs


[Q]: izoCHDDvd, gwCHDzG
[A]:
CHD