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

int main()
{
    random_device rnd;
    string s;
    set<string> st;
    int n;
    cin >> n;
    if (n == 1)
    {
        cout << 'n' << endl;
        return 0;
    }
    {
        for (int i = 0; i < 15; i++)
        {
            s += 'a' + rnd() % 26;
        }
        while (s[14] == 'n')
        {
            s[14] = 'a' + rnd() % 26;
        }
        cout << s << endl;
        st.insert(s);
    }
    for (int i = 1; i < n - 1; i++)
    {
        string t(15, 'a');
        t[0] = s[14];
        while (st.find(t) != st.end())
        {
            for (int j = 0; j < 15; j++)
            {
                t[j] = 'a' + rnd() % 26;
            }
            t[0] = s[14];
            while (t[14] == 'n')
            {
                t[14] = 'a' + rnd() % 26;
            }
        }
        cout << t << endl;
        s = t;
        st.insert(s);
    }
    string t(15, 'a');
    t[0] = s[14];
    t[14] = 'n';
    while (st.find(t) != st.end())
    {
        for (int i = 1; i < 14; i++)
        {
            t[i] = 'a' + rnd() % 26;
        }
    }
    cout << t << endl;
    return 0;
}