#include <bits/stdc++.h>
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pdd pair<double, double>
#define F first
#define S second
#define all(x) x.begin(), x.end()
using namespace std;

signed main()
{
    ios::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);

    vector<string> base;
    string s = "aa";
    for (int i = 0; i < 25; i++)
    {     
        base.emplace_back(s);
        s[1]++;
        base.emplace_back(s);
        s[0]++;
    }

    vector<string> res = base;
    while (res.size() < 5000)
    {
        vector<string> nxt;
        for (int i = 0; i < base.size(); i += 2)
        {
            for (auto s : res)
                nxt.emplace_back(base[i] + s);
            nxt.emplace_back(base[i + 1] + res.back());
            reverse(all(res));
        }
        res.swap(nxt);
    }
    res.resize(5000);
    for (int i = 0; i < 5000; i++)
        for (int j = i + 2; j < 5000; j++)
        {
            int diff = 0;
            for (int k = 0; k < res[i].size(); k++)
                if (res[i][k] != res[j][k])
                    diff++;
            assert(diff >= 2);
        }
    int n;
    cin >> n;
    for (int i = 0; i < n; i++)
        cout << res[i] << '\n';
}