# 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<<" ";
		for(int j = 0;j<i;j++)cout<<(char)(65+j);
		for(int j = i-2;j>=0;j--)cout<<(char)(65+j);
		cout<<"\n";
	}
	return 0;
}