#include <bits/stdc++.h>
using namespace std;
int arr[100];
string str[1000];
signed main() {
	ios::sync_with_stdio(false), cin.tie(0);
	int N;
	cin >> N;
	int i, j;
	for (i = 0; i < 130; i++) {
		for (j = 1; j <= 5; j++) str[i] += (char)('a' + arr[j]);
		for (j = 1; j <= 5; j++) {
			int chk = 1;
			if (arr[j] >= 25) chk = 0;
			if (j < 5 && arr[j] == arr[j + 1]) chk = 0;
			if (chk) {
				arr[j]++;
				break;
			}
		}
	}
	int p, q;
	p = q = 0;
	int dir = 1;
	for (i = 0; i < N; i++) {
		cout << str[p] << str[q] << '\n';
		if (p & 1) {
			p++;
			continue;
		}
		q += dir;
		if (q >= 125) {
			q = 124, p++;
			dir = -1;
		}
		if (q < 0) {
			q = 0, p++;
			dir = 1;
		}
	}
}