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) {
      Scanner sc=new Scanner(System.in);
       int n=sc.nextInt();
        for(int i=0;i<n;i++){
            if(i==0 || i==n-1){
                for(int j=0;j<n;j++){
                    System.out.print("*");
                }
            }else{
                System.out.print("*");
                for(int j=0;j<n-2;j++){
                    System.out.print(" ");
                }
                System.out.print("*");
            }
            System.out.println("");
        }
    }
}