//  SolutionToExercise_6_5.java  Copyright (c) 2006 Kari Laitinen

//  http://www.naturalprogramming.com

//  2006-02-12   File created.
//  2006-02-12   Last modification.


import java.util.* ;

class SolutionToExercise_6_5
{
   public static void main( String[] not_in_use )
   {
      Scanner keyboard = new Scanner( System.in ) ;

      int  growing_number    =  1 ;
      int  shrinking_number  =  20 ;
      System.out.print( "\n\n " ) ;

      while ( growing_number  <  shrinking_number )
      {
         System.out.print(  " "  +  growing_number
                         +  " "  +  shrinking_number ) ;

         growing_number  =  growing_number  +  2 ;
         shrinking_number  =  shrinking_number  -  3 ;
      } 
      
      System.out.print( "\n\n " ) ;
                  
      growing_number    =  1 ;
      shrinking_number  =  20 ;


      while ( growing_number  <  shrinking_number )
      {
         shrinking_number  =  shrinking_number  -  3 ;
         growing_number  =  growing_number  +  2 ;
         
         System.out.print(  " "  +  growing_number
                         +  " "  +  shrinking_number ) ;
      } 
      

      System.out.print( "\n\n " ) ;
   }
}