using System;
public class Program
{
public static void Main()
int num = int.Parse(Console.ReadLine());
for (int i = 1; i <= num; i++) {
if ((i==1) || (i==num)) {
for(int x = 0; x<num;x++) {
Console.Write('X');
}
} else {
for(int y = 1; y<=num; y++) {
if (y==1||y==num) {
Console.Write(' ');
Console.WriteLine(' ');