#include <bits/stdc++.h>
using namespace std;
int main(){
    int n;
    char g='A';
    cin>>n;
    for(int i=1;i<=n;i++){
        for(int j=n;j>i;j--) cout<<" ";
        for(char j='A';j<=g;j++) cout<<j;
        g+=2;
        cout<<endl;
    }
}
/**************************************************************
	Problem: 1095
	User: yangjunwen
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/