#include<queue>
#include<math.h>
#include<stack>
#include<stdio.h>
#include<iostream>
#include<vector>
#include<iomanip>
#include<string.h>
#include<algorithm>
#include<bits/stdc++.h>
using namespace std;
#define LL long long
const int N=1e6+10;
const int INF=0x3f3f3f3f;
int main()
{
	int n;
    cin >> n;
    for (int i=1;i<=n;i++)
	{
        for (int j=1;j<=n-i;j++)
		{
            cout<<" ";
        }
        for (int j=1;j<=i;j++)
		{
            cout<<char('A'-1+j);
        }
        for (int j=i-1;j>0;j--)
		{
        	cout<<char('A'-1+j);
		}
        cout<<endl;
    }
	return 0;
}