import java.util.*;
    public class Main{
        public static void main(String args[]){
            Scanner sc=new Scanner(System.in);
            int n=sc.nextInt();
            for(int i=1;i<=n;i++){
            	for(int j=1;j<=n;j++){
            		if(i==1||i==n||j==1||j==n){
            			System.out.print("*");
            		}
            		else{
            			System.out.print(" ");
            		}
            	}
            	System.out.println();
            }
    }
}
/**************************************************************
	Problem: 1492
	User: admin
	Language: Java
	Result: Accepted
	Time:1209 ms
	Memory:40204 kb
****************************************************************/