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]: yhhzISsXKEbA, KlPrazISsXKzmrVBG
[A]: zISsXK


[Q]: jadGIPTT, WfyGIPaG
[A]:
GIP