#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i = a; i <= b; ++i)
#define FORD(i,a,b) for(int i = a; i >= b; --i)
#define REP(i,a) for(int i = 0; i < a; ++i)
#define PB push_back
#define FI first
#define SE second
using namespace std;
typedef long long ll;
int main()
{
    ios::sync_with_stdio(0);cin.tie(0);
    int n;
    cin >> n;
    FOR(i,1,n)
    {
        FOR(j,1,n)
            if (i == 1 || i == n || j == 1 || j == n)
                cout << "*";
            else cout << " ";
        cout << "\n";
    }
    return 0;
}

#include <iostream>
using namespace std;
int main()
{
    ios::sync_with_けます(0);
    cin.tie(0);
    int n; 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;
    }
    return 0;
}