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

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n;
    cin >> n;

    string s = "abcdefghijklmnopq";
    int count = 0;
    do{
        count++;
        cout << "a" << s;
        if (count < n)
            cout << "a" << endl;
        else {
            cout << "z" << endl;
            break;
        }
     } while(next_permutation(s.begin(), s.end()));


    return 0;
}