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

vector <string> ans;

map <long long, bool> m;
long long xr[19];

int main(){
    ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
    int n;
    cin >> n;
    //n = 5000;
    //n = 5;

    xr[0] = 1;
    for(int i = 1; i <= 10; i++) xr[i] = xr[i - 1] * 26;

    string s = "aaaaaaaaaa";
    ans.push_back(s);

    while(ans.size() < n){
        //cout << ans.size() << s << "\n";
        bool did = 0;
        for(int j = 0; j < s.size(); j++){
            char CH = s[j];
            for(int ch = 0; ch < 26; ch++){
                s[j] = 'a' + ch;
                if(s == ans[0]) continue;

                long long hsh = 0;
                for(int i = 0; i < s.size(); i++){
                    hsh += xr[i] * (s[i] - 'a');
                }

                bool flag = 0;
                for(int i = 0; i < s.size(); i++){
                    if(m[hsh - xr[i] * (s[i] - 'a')]){
                        flag = 1;
                        break;
                    }
                }

                if(!flag){
                    ans.push_back(s);
                    did = 1;
                    //m[hsh - xr[j] * (s[j] - 'a')] = 1;
                    hsh -= xr[j] * (s[j] - 'a');
                    hsh += xr[j] * (CH - 'a');

                    char ca = s[j];
                    s[j] = CH;

                    for(int i = 0; i < s.size(); i++){
                        m[hsh - xr[i] * (s[i] - 'a')] = 1;
                    }

                    s[j] = ca;
                    CH = s[j];
                    break;
                }else{
                    s[j] = CH;
                }
            }
            //if(did) break;
        }

        if(!did) break;
    }

    for(int i = 0; i < n; i++){
        cout << ans[i] << "\n";
    }

    //cout << ans.size() << "\n";

    return 0;
}