#include<bits/stdc++.h>
using namespace std;
int main(){
	int i,j,n;
	cin>>n;
	for(i=1;i<=n;i++){
		cout<<"*";
	} 
	cout<<endl;
	for(i=2;i<=n-1;i++){
		cout<<"*";
		for(j=1;j<=n-2;j++){
			cout<<" ";
		}
		cout<<"*";
		cout<<endl;
	}
	for(i=1;i<=n;i++){
		cout<<"*";
	} 
	return 0;
}

/**************************************************************
	Problem: 1492
	User: tangkaixuan
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/