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 =10;
  // 
          
           
   
         
             for (int i=0; i<=a; i++)
            {
             
                for (int j =0; j<i; j++)
                
                    {
                        System.out.print("* ");
                    }
                
                System.out.println(" ");
              
                for(int k=10; k>i; k--)
                  {
                       System.out.print(" ");
                  }
                
            }
      
    
       
    
    
    
    }
}