#include<iostream>
using namespace std:
void printAlphabetTriangle(int height) 
{
    if(height < 1 || height > 26){
        cout<< "Invalid input" <<endl;
        return;
    }
    for (int i = 1;;i <= height; i++){
        for (int j = 1;j <= height - i; j++){
            
        }
        for (char ch = 'A' ; ch < 'A' + i; ch++) {
            
        }
        cout << endl;
    }
    
}
int main(){
    int height;
    cin >> height;
    printAlphabetTriangle(height);
    return 0;
}