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

namespace Lesenka
{
    class Program
    {
        static string eblan(int n)
        {
            string a = "";
            for (int i = 0; i < n; i++) a += " ";
            return a;
        }
        static void Main(string[] args)
        {

            int a = 0;
            do
            {
                a++;
                Console.Write(eblan(20-a) + a.ToString());
                Console.WriteLine();
            }
            while (a <20);
            Console.Read();

        }
    }
}