#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,i;
	cin>>n;
	int A=65;
	for(i=1;i<=n;i++){
	    for(int j=n-1;j>=i;j--){
	    	cout<<" ";
		}
	    for(int j=1;j<=2*i-1;j++){
	            cout<<(char)A;		
		}
		A++;
		cout<<endl;
	}
    return 0;
}
/**************************************************************
	Problem: 1094
	User: sf751616
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/