#include <iostream>
using namespace std;

int main() {
    int height;
    cin >> height;
    
    if(height < 1 || height > 26) {
        cout << "Invalid input" << endl;
        return 0;
    }
    
    
    for(int i = 1; i <= height;i++) {
        for(char ch = 'A'; ch < 'A' + i; ch++) {
        for(int j = 1;j <=i;j++){
            cout << ch;
        }
        cout << endl;
    }
    
    return 0;
}