#include<bits/stdc++.h>
using namespace std;
int n,i,j; 
int main(){
	cin>>n;
	for(i=1;i<=n;i++){
		cout<<"*";
		for(j=1;j<=n-2;j++){
			if(i==1||i==n) cout<<"*";
			else cout<<" ";
		}
		cout<<"*"<<endl;
	}
	
	
	return 0;
}
/**************************************************************
	Problem: 1492
	User: zhangziang
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/