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

[Q]: QKlzsmHyBcC, snPtzsmHdMIv
[A]: zsmH


[Q]: yJRITYgVTSNsPjG, NSIdKYgVTSNmj
[A]: YgVTSN


[Q]: XMtSwZVAHsNYhbyDm, asAVAHsNYhSPuNLrV
[A]:
VAHsNYh