#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==j||i+j==n+1) cout<<"X";
		else cout<<" ";
		cout<<endl;
	 }
 		
 return 0;
 }

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