Hello,

I started using Ruby few weeks ago and I have a little problem:

How do I inhibit the user of using numbers instead of letters?

For exemple, I created a program that asks the user his age, but I want
the user answer it using only numbers, not letters ('10', not 'ten').
Which command do I use for returning the line 'use just numbers', for
exemple?

Please, tell me anything, even if it looks 'hard' :P

Thank you

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