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

const int MN = 5005, M = 10;

int N; vector<string> ans{"aaaaaaaaaa", "baaaaaaaaa"};

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);

    cin >> N;
    for (int i = 1; i < 5; i++) {
        vector<string> pv = ans;
        ans.clear();
        for (int j = 0; j < 25; j+=2) {
            vector<string> ns;
            ns.insert(ns.end(), pv.begin(), pv.end());
            for (int n = 0; n < ns.size(); n++)
                ns[n][i<<1] = ns[n][i<<1|1] = 'a'+j;
            ns.push_back(pv.back());
            ns.back()[i<<1] = 'a'+j+1;
            ns.back()[i<<1|1] = 'a'+j;
            int n = ns.size();
            ns.insert(ns.end(), pv.rbegin(), pv.rend());
            for (; n < ns.size(); n++)
                ns[n][i<<1] = ns[n][i<<1|1] = 'a'+j+1;
            if (j+2 < 25) {
                ns.push_back(ns.back());
                ns.back()[i<<1] = 'a'+j+2;
            }
            ans.insert(ans.end(), ns.begin(), ns.end());
            if (ans.size() >= N) break;
        }
        if (ans.size() >= N) break;
    }
    for (int i = 0; i < N; i++)
        printf("%s\n", ans[i].c_str());

    return 0;
}