import java.util.*;
class Anu_Pattern
{
    public static void main(String []args)
    {
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int inc1=0;
        boolean flag=false;
        for(int x=0;x<(2*n);x++)
        {
            if(x<(n+1))
            {
                System.out.print("@");
            }
            for(int y=0;y<inc1;y++)
            {
                System.out.print(" ");
            }
            if(flag==false)
            {
                if(x<(n-1))
                {
                    inc1+=(n-1);
                }
                else if(x==(n-1))
                {
                    inc1+=n;
                }
                else
                {
                    inc1+=1;
                    flag=true;
                }
            }
            if(x<n)
                for(int z=0;z<n;z++)
                {
                    System.out.print("*");
                }
            if(x>=(n-1))
            {
                System.out.print("@");
            }
            System.out.println();
        }
    }
}