using System;

namespace ThirdDigitIsSeven
{
    class ThirdDigit7
    {
        static void Main()
        {
            while (true)
            {
                int number;
                bool thirdDigitIsSeven = false;
                Console.WriteLine("Enter a number to check if it's third digit from right to left is 7");
                bool valid = int.TryParse(Console.ReadLine(),out number);
                if (valid && number <= int.MaxValue)
                {
                    thirdDigitIsSeven = ((number % 1000) / 100 == 7);
                    Console.WriteLine(thirdDigitIsSeven);
                }
                else
                {
                    Console.WriteLine("Invalid input!Try again:");
                }

            }
        }
    }
}