On 04/08/2013 07:24 AM, leonardo wrote: > > thanks adam, but it is not clear to me yet. > if i open the terminal how do i work on it? what should i type in? Please don't top-post. It kills off the context. Go back to the previous message and you'll see Adam tells you exactly what to type at the terminal. But to be more literal: python ex13.py first 2nd 3rd -- DaveA