In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
--------
Question: XSnVeAjWLFWTgwmf, WsByLAjWLFWnQfl

Answer: AjWLFW


Question: OYERnjubLFovtcS, FngzQJVGERnjubLFafmzq

Answer: ERnjubLF


Question: azYAVwtaXmNsSzxxKiacYpkGQxzye, BaLmcdmNsSzxxKiaWUbFEfVua

Answer:
mNsSzxxKia