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

int main() {
	int n;
	while (~scanf("%d", &n)) {
		mt19937 re;
		for (int i = 0; i < n; ++ i) {
			string s;
			s += 'a';
			for (int k = 0; k < 18; ++ k) {
				s += char('a' + re() % 26);
			}
			s += i == n - 1 ? 'n' : 'a';
			puts(s.c_str());
		}
	}
}