using System;

public class Program

{

    public static void Main()

    {

        // Loop through each row

        for (int row = 4; row >= 1; row--)

        {

            // Print numbers from 1 to i

            for (int num = 1; num <= row; num++)

            {

                Console.Write(num);

            }

            // Move to the next line after each row

            Console.WriteLine();

        }

    }

}