Exercize to understand from three numbers which is more high

[^Bart]

> Hm, what does your script print if there are equal numbers?

Insert the first number: 5
Insert the second number: 6
Insert the third number: 5
Number max is:  6
Number middle is:  5
 >>>

The exercize was made to improve the use of if with three different 
conditions, maybe it could be nice to write something like "there isn't 
a middle number" but it goes further the exercize! :)