#include <bits/stdc++.h>
using namespace std;
int main(){
    int i,j,n; 
    char a[15][15]={0};
    cin>>n;
    for(i=n-1;i>=0;i--){
        for(j=0;j<n;j++){
            if(i+j>n-1){
                a[j][i]=65+j+i-n;
            }else{
                a[j][i]=65+j+i;
            }
             
        }
    }
    for(i=0;i<n;i++){
        for(j=0;j<n;j++){
            cout<<setw(3)<<a[i][j];
        }
        cout<<endl;
    }
     
}
/**************************************************************
	Problem: 1193
	User: wangzherongyao
	Language: C++
	Result: Wrong Answer
****************************************************************/