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());
}