#include <bits/stdc++.h>
using namespace std;
int main(){
	int n,i,j,s;
	cin>>n;
	int a[n][n];
	for(i=0;i<=n;i++){
		for(j=0;j<=n-i-1;j++){
			a[i][j]=j+i+1;	
		}
	}
	for(i=1;i<n;i++){
		for(j=n-i;j<n;j++){
			a[i][j]=n-i+n-j-1;	
		}	
	}
	for(i=0;i<n;i++){
		for(j=0;j<n;j++){
			s=a[i][j]+64;
			cout<<setw(3)<<char(s);
		}
		cout<<endl;
	}
	return 0;
	}

/**************************************************************
	Problem: 1194
	User: fzy001
	Language: C++
	Result: Wrong Answer
****************************************************************/