#include<bits/stdc++.h>
using namespace std;
int main(){
int n;
cin>>n;
for(int i=1;i<=n;i++){
	for(int j=1;j<=n;j++){
		if(i==1||i==n||j==1||j==n){
			cout<<"*";
		}
		else cout<<" ";
	}
cout<<endl;		
	
}
	return 0;
}

/**************************************************************
	Problem: 1492
	User: linweilun
	Language: C++
	Result: Accepted
	Time:17 ms
	Memory:2072 kb
****************************************************************/