using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        bool exit = false;

        do {

            exit = ProcessInput();

        }

        while(!exit);

    }

    private static bool ProcessInput()

    {

        string nameCapInput = Console.ReadLine();

        bool containsInt = nameCapInput.Any(char.IsDigit);

        bool isMadeOfLettersOnly = nameCapInput.All(c => char.IsLetter(c) || char.IsWhiteSpace(c));

        if (nameCapInput.Equals("exit", StringComparison.CurrentCultureIgnoreCase))

        {

            return true;

        }

        else if (containsInt)

        {

            Console.WriteLine("You can't capitalize numbers. Use letters only. Try again.");

        }

        else if (isMadeOfLettersOnly)

        {

            string upper = nameCapInput.ToUpper();

            Console.WriteLine("The uppercase version of your entered text is: {0}", upper);

        }   

        return false;

    }

}