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

int main()
{
	random_device rnd;
	int n;
	cin >> n;
	if (n == 1)
	{
		cout << 'n' << endl;
		return 0;
	}
	set<string> st;
	string s;
	{
		for (int i = 0; i < 20; i++)
		{
			s += 'a' + rnd() % 26;
		}
		while (s[19] == 'n')
		{
			s[19] = 'a' + rnd() % 26;
		}
		cout << s << endl;
	}
	st.insert(s);
	for (int i = 1; i < n - 1; i++)
	{
		string t;
		t += s[19];
		for (int j = 1; j < 19; j++)
		{
			t += 'a' + rnd() % 26;
		}
		t += 'n';
		while (t[19] == 'n')
		{
			t[19] = 'a' + rnd() % 26;
		}
		while (st.find(t) != st.end())
		{
			t = s[19];
			for (int j = 1; j < 19; j++)
			{
				t += 'a' + rnd() % 26;
			}
			t += 'n';
			while (t[19] == 'n')
			{
				t[19] = 'a' + rnd() % 26;
			}
		}
		cout << t << endl;
		s = t;
		st.insert(s);
	}
	s = s[19];
	for (int i = 1; i < 19; i++)
	{
		s += 'a' + rnd() % 26;
	}
	cout << s << 'n' << endl;
	return 0;
}