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

int main()
{
    random_device rnd;
    int n;
    cin >> n;
    string s;
    {
        for (int i = 0; i < 20; i++)
        {
            s += 'a' + rnd() % 26;
        }
        cout << s << endl;
    }
    for (int i = 1; i < n; i++)
    {
        string t;
        t += s[19];
        for (int j = 1; j < 20; j++)
        {
            t += 'a' + rnd() % 26;
        }
        cout << t << endl;
        s = t;
    }
    return 0;
}