#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,i,j;
    char x=64;
    cin>>n;
    char a[11][11]={0};
    for(i=0;i<n;i++){
        for(j=0;j<n;j++){
            if(i+j<n){
            	x=j+i+1+64;
            	a[i][j]=x;
			}else{
				x=2*n-(i+j)-1+64;
				a[i][j]=x;
			}
        }
    }
    /*
     
     
     
    */
    for(i=0;i<n;i++){
        for(j=0;j<n;j++){
            printf("%3c",a[i][j]);
 
        }
        cout<<endl;
    }
    return 0;
}
/**************************************************************
	Problem: 1194
	User: tangkaixuan
	Language: C++
	Result: Wrong Answer
****************************************************************/