#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 y=1;y<=i2;y++)cout<<char(y+'A'-1);
		i2+=2;
		cout<<"\n";
	}
	return 0;
}

/**************************************************************
	Problem: 1095
	User: zhouhongyi
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2072 kb
****************************************************************/