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

XpFCxFOgTTNCnQzMnVPV, FMqzdOwgTTNCnQzedorxVPe
gTTNCnQz

QqtCFzXHPNFXx, XECFzXHPSGwUuk
CFzXHP

fRbxBCeHIInOLitm, rzNHIInOLiPoMNk

HIInOLi