#include <bits/stdc++.h>

using namespace std;

#define all(x) (x).begin(), (x).end()

int main() {
    cin.tie(0)->sync_with_stdio(0);

    int n;
    cin >> n;
    
    vector<string> forward;
    for (char i = 'a'; i < 'z'; i++) {
        string s = "aa";
        s[0] = i;
        s[1] = i;
        forward.push_back(s);
        s[1] = i + 1;
        forward.push_back(s);
    }
    forward.push_back("zz");

    cout << "\n";
    
    vector<string> words;
    for (auto& k : forward) {
        words.push_back("aa" + k);
    }


    for (int i = 'a'; i < 'z'; i++) {
        string s = "aa";
        s[0] = i;
        s[1] = i + 1;
        words.push_back(s + forward.back());
        reverse(all(forward));
        s[0] = i + 1;
        for (auto& k : forward) {
            words.push_back(s + k);
        }
    }

    vector<string> wordCp = words;
    for (int j = 'a'; j < 'f'; j++) {
        string s1 = "aa";
        s1[0] = j;
        s1[1] = j + 1;
        words.push_back(s1 + wordCp.back());
        reverse(all(wordCp));
        s1[0] = j + 1;
        for (auto& k : wordCp) {
            words.push_back(s1 + k);
        }
    }

    for (auto& k : words) {
        if (k.size() < 6) {
            k = "aa" + k;
        }
    }

    assert(words.size() >= n);
    words.resize(n);

    // cout << words.size() << "\n";
    for (auto& k : words) {
        cout << k << "\n";
    }

    return 0;
}