#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

char get(){
    while(true){
        int ans = rand() % 26;
        if(ans != 'n' - 'a'){
            return ans + 'a';
        }
    }
}

int main(){
    int n;
    cin >> n;
    char back = 'a';
    for(int i = 0; i < n - 1; i++){
        cout << back;
        for(int j = 0; j < 18; j++){
            cout << get();
        }
        back = get();
        cout << back << endl;
    }
    cout << back << "n" << endl;
}