#include<iostream>
#include <cstring>
using namespace std;
int main(){
    int n,i,j,k,c;
    char x;
    cin>>n;
    c=1;
    for(int i=1;i<=n;i++){
        x='A';
        for(int k=n-1;k>=i;k--){
            cout<<" ";
        }
        for(int j=1;j<=c;j++){
            cout<<x;
            x=int(x)+1;
            x=char(x);
        }
        cout<<endl;
        c+=2;
    }
    return 0;
}
/**************************************************************
	Problem: 1095
	User: wengzihang
	Language: C++
	Result: Accepted
	Time:23 ms
	Memory:2072 kb
****************************************************************/