package net.ipipip0129.yukicoder.no701;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int num_cnt = scan.nextInt();
        String prev_str = "aaa";

        List<String> stringList = new ArrayList<>();

        for (int i = 0; i < num_cnt - 1; i++) {
            while (true) {
                String moji = createRandomString(prev_str.charAt(0), prev_str.charAt(prev_str.length() - 1));
                if (!stringList.contains(moji)) {
                    stringList.add(moji);
                    prev_str = moji;
                    System.out.println(moji);
                    break;
                }
            }
        }

        System.out.println(createRandomString(prev_str.charAt(0), 'n'));
    }

    public static String createRandomString(Character begin, Character end) {
        Random rand = new Random();
        StringBuilder sb = new StringBuilder();

        sb.append(begin);

        for (int i = 0; i < 18; i++) {
            sb.append(Character.toChars(rand.nextInt(26) + 97 ));
        }

        sb.append(end);

        return sb.toString();
    }
}