//No.701 ひとりしりとり
#include<iostream>
#include<string>
#include<stdlib.h>
#include<time.h>
using namespace std;
string crt_str(char _pre_char);
int main()
{
	srand((unsigned int)time(NULL));
	int n;
	cin >> n;
	cout << "apple" << endl;
	char pre_char = 'e';
	string tmp_str;
	for (int i = 0; i < n-1; i++) {

		tmp_str = crt_str(pre_char);
		pre_char = tmp_str[tmp_str.length() - 1];
		if (i == (n - 2))tmp_str += 'n';
		else if (tmp_str[tmp_str.length() - 1] == 'n')tmp_str += 'b';
		cout << tmp_str << endl;
	}
	return 0;
}

string crt_str(char _pre_char) {
	//1~20
	string str;
	str += _pre_char;
	char tmp_char;
	int ran = rand() % 15 + 5;
	for (int i = 0; i < ran; i++) {
		tmp_char = rand() % ('z' - 'a') + 'a';
		str += tmp_char;
	}
	return str;
}