#include<bits/stdc++.h>
using namespace std;
int n,a[10][10],z; 
int main(){
    cin>>n;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            if(i+j<=n+1)a[i][j]=i+j-1+64;    
            else a[i][j]=i+j-1-n+64;
        }   
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            cout<<setw(3)<<(char)a[i][j];   
        }
        cout<<endl;   
    }
    return 0;
}
/**************************************************************
	Problem: 1194
	User: lihean
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/