Need a little help

Question

I have a little problem with this code ,if the user entered a Character I want to display a message but how to do it
https://code.sololearn.com/c6Ccu3a52iP3/?ref=app

Answer 1

https://code.sololearn.com/c99N2WJ0Pjdd/?ref=app

Answer 2

Olek Szczepura , when the user enter a number the code works smoothly but the problem was if the user entered a character it gives me an error ,,, how to solve this???