using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace yukiCoder {
    class Program {
        static void Main(string[] args) {
            shiritori(int.Parse(Console.ReadLine()));
            Console.ReadKey();
        }
        public static void shiritori(int line) {
            string word = null;
            var lastword = new List<string>();
            var rndList = new List<byte>();
            var rnd_word = new Random(Environment.TickCount);
            var rnd_len = rnd_word;
            for (int i = 0; i < line; i++) {
                do {
                    for (int j = 0; j < rnd_len.Next(2, 20); j++) {
                        rndList.Add(byte.Parse(rnd_word.Next(65, 91).ToString()));
                    }
                    word = Encoding.ASCII.GetString(rndList.ToArray()).ToLower();
                } while (lastword.Where(x => x.Contains(word)).Count() > 0);
                if (lastword.Count() == 0) {
                    Console.WriteLine(word);
                }
                else {
                    char c = lastword.Last().Last();
                    string s = word.Substring(1, word.Length - 1);
                    s = c + s;
                    Console.WriteLine(s);
                }
                lastword.Add(word);
                rndList.Clear();
            }
        }
    }
}