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.print("\n");
       
       }


           System.out.println("in reverse  ");
         
           for (int i =8; i>0;i-- )
       {
       
               for (int j=0;j<i;j++)
            {
                 System.out.print("*");
            }
        
          System.out.print("\n");
       }












  
    }
}