#include <bits/stdc++.h>
using namespace std;

int main() {
	cin.tie(0)->sync_with_stdio(0);

	int n; cin >> n;

	vector<int> a(7);

	auto print = [&]() {
		for (int i : a) cout << char('a'+i);
		cout << '\n';
	};
	print();
	n--;

	auto incr = [&](int i) {
		if (++a[i] == 26) a[i] = 0;
		print();
		if (not --n) exit(0);
	};

	int one = 25, two = 25;

	while (1) {
		if (a[0] == one) {
			if (a[3] == two) {
				incr(5);
				incr(6);
				two = (two+25) % 26;
			}
			incr(3), incr(4);
			one = (one+25) % 26;
		}

		incr(0), incr(2), incr(1);
	}
}