The world object has many, many useful functions including a way to ask the user for information—say  a number, a name or something.

1.  Click on world
2.  click on functions
3. scroll down ot the ask user functions (See Diagram 1 ) and read below for more

Diagram 1

Animated Gif showing the whole process of asking user for a number and then saying that number (using what as a String)