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 = 11;
        
        for (int i =0; i<a; i++)
   
       { 
           
              for (int j=0;j<i;j++)
          {
           
              System.out.print("**");
          }  
               System.out.print("\n");
        
               for (int k=10;k>i;k-- )
                 System.out.print(" ");
                 
             //   for (int s=0; s<i ; s++)
             //  System.out.print("  ");
       
       }


        












  
    }
}