#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=n-i;j++)
		{
			cout<<" ";
		}
		char ch='A'+i-1;
		for(char c=ch;c>='A';c--)
		{
			cout<<c;
		}
		for(char c='B';c<=ch;c++)
		{
			cout<<c;
		}
		cout<<endl;
	}
	return 0;
}

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