#include<iostream>
using namespace std;
int main() {
	int n;
	cin >> n;
	char t = 'A';
	for (int i = 0; i < n; i++) {
		for (int j = 0; j <= i; j++) {
			cout << t;
			if (t != 'Z')t++;
			else t = 'A';
		}
		cout << endl;
	}
	return 0;
}

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