因为截图太大了，这里直接放谜题图片和 Null 的话。

Dear Prof:

hello!It's the time to tell you all the truths.

you're the only man who can save he first parallel universe.

work out this question and put the answer onto your Lou-gu mainpage before 1.31

JohnMelen is a bad man.he just wants to kill all the people in the first parallel universe.you should trust me and then you will save the first parallel universe.

don't ask me why i do not save the first parallel universe and work out this question by myself.First,I don't have the permission to use password.Second,the question is so hard that I cant work out it.

To save that world,I hope you can trust me.

Our organization's name is Italian Hamburger.Our mission is to maintain the order of the seven parallel universes.But you are the only person who can save that world. We only rely on you. You are the son of God.

JohnMelen is from Apple Pie that is an evil organization.Their mission is to destroy the first six parallel universes and become the hegemon in the seventh parallel universe.So,do not trusr the member of Apple Pie.They are all bad.

OK,good luck!

Code:Null.

说句实话我不想第一平行宇宙灭亡（虽然是假的），所以紧急求助啊qwq