#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: wenda
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/