How do i turn the text field values into a number?

Hi there,

I have a customer satisfaction app and I have a number of questions with multiple choice text fields with values like this:

5-Extremely professionally
4-Very professionally
3-Somewhat professionally
2-Not so professionally
1-Not at all professionally

I need to take the first character and turn it into the number above so I can calculate my ratings.

What's the best way of handing this?

Thanks,