#include<bits/stdc++.h>
using namespace std;
int n;
int main(){
    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;
    }
}
/**************************************************************
	Problem: 1492
	User: linzihang
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/