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

[Q]: DwkTGsIXLfmjMV, VqRlMxtsSBkTGsIXLfmjbvI
[A]: kTGsIXLfmj


[Q]: SQNzngllNbOkKDK, MijfNzngllNDfWge
[A]: NzngllN


[Q]: CHyengs, WgGyenhIt
[A]:
yen