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

QKlzsmHyBcC, snPtzsmHdMIv
zsmH

DUhUbmfLuOFAQann, kwnzfLuOFAErR
fLuOFA

uVgRaGornfAPloSthO, ZVornfAPEqhUn

ornfAP