#include <string>
#include <vector>
#include <iostream>

using namespace std;

int N;
string arr[51];

int main(){
    cin >> N;
    int w = 0;
    for(int k = 0; k < 51; k++){
        arr[k] = (char) ('a' + k/2);
        arr[k] += (char) ('a' + (k+1)/2);
        //cout << arr[k] << endl;
    }
    string first;
    string second;
    string third;
    for(int i = 0; i < 25; i++){
        first = arr[2*i];
        for(int j = 0; j < 26; j++){
            if(i % 2 == 0)
                second = arr[2*j];
            else
                second = arr[50 - 2*j];
            for(int k = 0; k < 51; k++){
                if(j % 2 == 0)
                    third = arr[k];
                else{
                    third = arr[50 - k];
                }
                cout << first << second << third << endl;
                w++;
                if ( w == N )
                    break;
            }
            if ( w == N )
                    break;
            if(j < 25){
                if(i % 2 == 0)
                    second = arr[2*j + 1];
                else
                    second = arr[49 - 2*j];
                cout << first << second << third << endl;
                w++;
            }
            if ( w == N )
                    break;
        }
        if ( w == N )
            break;
        first = arr[2*i + 1];
        cout << first << second << third << endl;
        w++;
        if ( w == N )
            break;
    }
}