import java.util.*;
import java.lang.*;
import java.io.*;

// The main method must be in a class named "Main".
class Main {
    public static void main(String[] args) {
        System.out.println("Hello world!");
        int a= 5;
       for ( int i= 0 ; i<a; i++)
 {
         
         
               for ( int j =0; j<i ;j++)
            {  System.out.print(j);
            }
      System.out.print(",");
          for ( int g=5; g>0; g--)
        {  System.out.println(g);
     
        }
     
 } 
 
 
 
 
 
 
 
 
 
 
 
   }
}