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

/**************************************************************
	Problem: 1492
	User: ccf
	Language: C++
	Result: Accepted
	Time:23 ms
	Memory:2072 kb
****************************************************************/