#pragma GCC optimize("Ofast")
#pragma GCC optimize("O3")

#include <bits/stdc++.h>
using namespace std;

#define el '\n'
#define F first
#define S second

typedef long long ll;
typedef long double ld;

bool multipleTestCases = 0, sublime = 1;
const int N = 1e6 + 5, INF = 1e9 + 5, mod = 1e9 + 7, LOG = 22, SQ = 500;


string f = "aa", s = "aaaaaaaa";
vector<string> v = {f + s};

void inc() {
    for(int j = 0; j < 25; j++) {
        for (int i = 0; i < 8; i++) {
            s[i]++;
            v.push_back(f + s);
        }
    }
}

void dec() {
    for(int j = 0; j < 25; j++) {
        for (int i = 0; i < 8; i++) {
            s[i]--;
            v.push_back(f + s);
        }
    }
}


void doWork() {
    while (v.size() < 5e3) {
        inc();
        f[0]++;
        v.push_back(f + s);
        f[1]++;
        v.push_back(f + s);
        dec();
        f[0]++;
        v.push_back(f + s);
        f[1]++;
        v.push_back(f + s);
    }

    int n;
    cin >> n;
    for (int i = 0; i < n; i++) {
        cout << v[i] << el;
    }
}

signed main() {
#ifdef ONLINE_JUDGE
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
#endif
#ifndef ONLINE_JUDGE
    if (sublime) {
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    }
#endif
    int tests = 1;
    if (multipleTestCases) {
        cin >> tests;
    }
    for (int tc = 1; tc <= tests; tc++) {
        doWork();
    }
}