#include <bits/stdc++.h>
using namespace std;
int main(){
    int i,i2;
    cin>>i;
    i2=1;
    for(int k=i;k>0;k--){
        for(int y=1;y<k;y++)cout<<" ";
        for(int ii=i2-1;ii>=1;ii--)cout<<char(ii+'A');
        cout<<"A";
        for(int ii=1;ii<i2;ii++)cout<<char(ii+'A');
        i2++;
        cout<<"\n";
    }
    return 0;
}
/**************************************************************
	Problem: 1096
	User: zhouhongyi
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2072 kb
****************************************************************/