#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;

mt19937 rng(1010101);
int rint(int l, int r) {
    return uniform_int_distribution<int>(l, r)(rng);
}

void solve() {
    int n;
    cin >> n;

    string s;
    vector<string> ans;
    for (int i=0; i<10; ++i) s += 'a';
    ans.push_back(s);
    for (int i=1; i<n; ++i) {
        bool ok = false;
        while (!ok) {
            ok = true;
            int p = rint(0, 9);
            char ch = rint('a', 'z');
            // print(i, p, ch);
            string tmp = s;
            tmp[p] = ch;
            for (int i=(int)ans.size()-2; i>=0; --i) {
                int cnt = 0;
                for (int j=0; j<10; ++j) cnt += (tmp[j] != ans[i][j]);
                if (cnt <= 1) {
                    ok = false;
                    break;
                }
            }
            if (ok) {
                s = tmp;
                ans.push_back(s);
            }
        }
    }

    for (string t: ans) cout << t << '\n';
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    solve();
}