#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	for(int i=1;i<=n;i++){
		for(int j=1;j<=n;j++){
			if(i==j||i+j==n+1){
				cout<<"X";
			
			}	cout<<" ";
		}cout<<endl;
	}
}
	
/**************************************************************
	Problem: 1239
	User: dengyuanyan
	Language: C++
	Result: Presentation Error
****************************************************************/