#include <bits/stdc++.h>
using namespace std;
int main(){
	int b,j,i,sb;
	char s='A',bb=s;
	cin>>b;
	for(i=1;i<=b;i++){
		for(sb=1;sb<=b-i;sb++)
				cout<<" ";
				bb=s+i-1;
		for(j=1;j<=i;j++){
			cout<<bb;
			bb--;
		}
		bb+=2;
		for(j=1;j<=i-1;j++){
			cout<<bb;
			bb++;
		}
		cout<<endl;
	}
	
	
	return 0;
	}

/**************************************************************
	Problem: 1096
	User: fzy001
	Language: C++
	Result: Accepted
	Time:35 ms
	Memory:2072 kb
****************************************************************/