#include<stdio.h>
int main(){
	int n,i,j;
	scanf("%d",&n);
	int a[n][n];
	for(i=0;i<n;i++){
		a[i][0]=i+1;
		for(j=1;j<n-i;j++){
			a[i][j]=a[i][j-1]+1;
		}
		for(j=n-i;j<n;j++){
			if(j==n-i){
				a[i][j]=1;
			}else{
				a[i][j]=a[i][j-1]+1;
			}
		}
	}
	for(i=0;i<n;i++){
		for(j=0;j<n;j++){
			printf("%3c",(a[i][j]+'A'-1));
		}
		printf("\n");
	} 
return 0;
} 








/**************************************************************
	Problem: 1194
	User: admin
	Language: C
	Result: Accepted
	Time:11 ms
	Memory:1144 kb
****************************************************************/