import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner diva = new Scanner(System.in);
        int n = diva.nextInt();
        if (!diva.nextInt()) {
            System.out.print("Invalid input");
            return;
        }
        int st = 1;
        int sp = n-1;
        if(n<0 || n>=10){
            System.out.print("Invalid input");
            return;
        }
        for(int i=1;i<=n;i++){
            for(int j=1;j<=sp;j++){
                System.out.print(" ");
            }
            for(int k=1;k<=st;k++){
                System.out.print("*");
            }
            System.out.println();
            sp--;
            st+=2;
        }
    }
}