Sorting numbers in LISP
It's been a while since I've used lisp, so I can't really critique your code for style or any common lisp gotchas.

That said, the biggest thing I notice here is that the code for generating the 3 numbers, sorting them, and printing the result are all tightly coupled with each other.  I would suggest defining a separate function that takes three numbers and returns them in sorted order, which can then be combined with your existing functions for generating three numbers and printing three numbers to give the desired output.  The added benefit, of course, is that this sort function can later be used to sort any three numbers, not just the three in this bit of code.