#include<bits/stdc++.h>
using namespace std;
int main(){
    char a[15][15]={0};
    int i,j,n;
    cin>>n;
    for(i=0;i<n;i++){
    	for(j=0;j<n;j++){
    		if(i+j<n){
    			a[i][j]=65+i+j;
    		}else{
    			a[i][j]=60+i+j;
    		}    
    	}
    }
    for(i=0;i<n;i++){
    	for(j=0;j<n;j++){
    		cout<<setw(3)<<a[i][j];
    	}
    	cout<<endl;
    }
		
}

/**************************************************************
	Problem: 1194
	User: wngjinming
	Language: C++
	Result: Wrong Answer
****************************************************************/