#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin >> n;
    char a[10][10];
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            a[i][j] = 'A' + (i + j) % n;
        }
    }  
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            cout <<setw(3)<< a[i][j];
        }
        cout << endl;
    }
      
    return 0;
}
 
/**************************************************************
	Problem: 1194
	User: wuyichen
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/