10 prisoners are held captive by a cruel warden. One day he gathers them in the prison hall and tells them about a new game he wants to play:

> 
> "Tomorrow, I will assign each one of you a random single digit number known only to me, for you knuckleheads: that's zero to nine! Each one of you will get a number independently of others - for all I care everyone of you is a zero. I will then put you in isolated cells, and through the food slot give each of you a list. This list will contain **all of the other** prisoners numbers in a random order. One by one, I will then remove every prisoner from his dirty cell and ask him what number he thinks he was assigned. I will then put him back in isolation. Don't think for a second you'll hear his guess, the isolation cells are sound proof. If **at least** one of you miserable lowlifes guesses his own number correctly, you are all free to leave. But if not, you will be denied of food until you die horribly.
>  Don't think for a second I will tolerate any form of communication between yourselves after put in isolation. I will personally execute anyone who dares break this rule. You may discuss your strategy until tomorrow. Goodbye for now"
> 
> 
> 

He then shuts the door of the hall close and leaves them be.

One of the prisoners then shouts out loud:

> 
> "I have a strategy that will get us all out for sure!"
> 
> 
> 

**Assuming his statement was true, can you explain what might this strategy be?**