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

return 0;
}

/**************************************************************
	Problem: 1239
	User: cx001
	Language: C++
	Result: Accepted
	Time:18 ms
	Memory:2072 kb
****************************************************************/