Creating a variable for ID number

Hi Heroes,

I am creating a course and I want the user to enter his/hers ID number in the 2nd slide. the challenge I'm struggling with is that I want to make sure the user enters 9 digits (that's a full ID number) - no more no less, and I don't which variable  should I use (Text? Numeric? True/False?) and how to adjust the variable.

Would vary much appreciate your assistance on this one.



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