#include <bits/stdc++.h>
using namespace std;
char n;
int main(){
	cin>>n;
	int a=n-'A'+1;
	for(int i=1;i<=a;i++){
		for(int j=1;j<=a-i;j++){
			cout<<" ";
		}
		char qq='A';
		for(int j=1;j<=i;j++){
			cout<<qq;
			qq++;
		}
		qq=qq-2;
		for(int j=1;j<=i-1;j++){
			cout<<qq;
			qq--;
		}
		cout<<endl;
	}
}

#include<cstdio>
#include<iostream>
using namespace std;

int main(){
    char ch;
    cin>>ch;
    for(char i='A';i<=ch;i++){
        for(int j=1;j<=ch-i;j++)printf(" ");
        for(int j='A';j<=i;j++)printf("%c",j);
        for(int j=i-1;j>='A';j--)printf("%c",j);
        printf("\n");
    }
    return 0;
}