using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _01PrintStringsLetters
{
    class PrintStringsLetters
    {
        static void Main(string[] args)
        {
            //var
            int num = int.Parse(Console.ReadLine());

            if (num >= 100 && num <= 200 || num == 0)
            {
                Console.WriteLine("");
            }

            else if (num < 0 || num > 200 || num < 100)
            {
                Console.WriteLine("invalid");
            }
        }
    }
}