#include <bits/stdc++.h>
using namespace std;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n;
    cin >> n;
    string s = "aaaaaa";
    vector<int> d(3, 1);
    vector<string> v = {s};
    int i = 2;
    while (v.size() < n) {
        if (d[i] == 1 and s[i * 2] == 'z') {
            d[i] = -1;
            i -= 1;
        }
        else if (d[i] == -1 and s[i * 2] == 'a') {
            d[i] = 1;
            i -= 1;
        }
        else {
            s[i * 2 + 1] += d[i];
            v.push_back(s);
            s[i * 2] += d[i];
            v.push_back(s);
            i = 2;
        }
    }
    for (int i = 0; i < n; i += 1)
        for (int j = i + 2; j < n; j += 1) {
            int s = 0;
            for (int k = 0; k < 6; k += 1)
                s += v[i][k] != v[j][k];
            assert(s >= 2);
        }
    for (int i = 0; i < n; i += 1)
        cout << v[i] << "\n";
    return 0;
}