#include<bits/stdc++.h>
using namespace std;
int main()
{
	int i,n,t=1,j,a[10][10],s=64;
	cin>>n;
	for(i=0;i<n;i++){
		for(j=0;j<n-i;j++){
			a[j][i]=s+i+j+1;
		}
		for(j=0;j<i;j++){
			a[n-i+j][i]=s+j+1;
		}
	}
	for(i=0;i<n;i++){
		for(j=0;j<n;j++){
			cout<<setw(3)<<char(a[i][j]);
		}
		cout<<endl;
	}
	return 0;
}

/**************************************************************
	Problem: 1194
	User: zzz
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/