#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define llong long long

int main() {
    int n;
    cin >> n;

    string aa = "abcdefghijklmnopqrstuvwxyz";
    int i = 0;
    rep(a, 26) {
        rep(b, 26) {
            rep(c, 26) {
                rep(d, 26) {
                    rep(e, 26) {
                        if(i == n-1) break;
                        cout << "a" << aa[a] << aa[b] << aa[c] << aa[d] << aa[e] << "a\n";
                        i++;
                    }
                }
            }
        }
    }
    cout << "an\n" << endl;
}