using System;

public class Program

{

    public static void Main()

    {   string input= "abcd";

     //string output="";

        for(int i=0; i<input.Length; i++)

        {

            string output=" ";

            for(int j=i; j<input.Length; j++)

            {   //string output=" ";

                output=output+input[j];

               Console.WriteLine(output);

                //Console.WriteLine(input[i].ToString());

            }

        }

    }

}