#include<stdio.h>
#include<iostream>
#include<algorithm>
using namespace std;
int main (){
    string s = "abcdefghijklmop";
    int n;
    cin >> n;
    string x;
    for(int i=0; i<n; i++){
        if( i % 2 == 1) cout << 'a';
        else cout << 'b';
        cout << s;
        next_permutation( s.begin(), s.end());

        if ( i == n-1 && i % 2 == 0) cout << "an";
        else if ( i == n-1 && i % 2 == 1) cout << "bn";
        else if( i % 2 == 1) cout << 'b';
        else cout << 'a';
        cout << endl;
    }
    return 0;
}