#include <bits/stdc++.h>

using namespace std;


void hawawa()
{
	int n;
	cin >> n;
	for (int i = 1; i < n; i++) {
		cout << string(i, 'a') << "\n";
	}
	cout << "an" << "\n";
}

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	hawawa();
	return 0;
}