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

class Program
{
    static void Main(string[] args)
    {
        int start = int.Parse(Console.ReadLine());
        int end = int.Parse(Console.ReadLine());

        char[] letters = { 'a', 'b', 'c', 'd', 'e' };
        int[] lettersNumbers = { 5, -12, 47, 7, -32 };
        bool noFSl = true;
        string output = "";
        List<char> lettersList = new List<char>();

        for (int e = 0; e < letters.Length; e++)
        {
            for (int d = 0; d < letters.Length; d++)
            {
                for (int c = 0; c < letters.Length; c++)
                {
                    for (int b = 0; b < letters.Length; b++)
                    {
                        for (int a = 0; a < letters.Length; a++)
                        {
                            int weight = 0;
                            lettersList.Add(letters[a]);
                            lettersList.Add(letters[b]);
                            lettersList.Add(letters[c]);
                            lettersList.Add(letters[d]);
                            lettersList.Add(letters[e]);
                            lettersList = lettersList.Distinct().ToList();

                            for (int i = 0; i < lettersList.Count; i++)
                            {
                                switch (lettersList[i])
                                {
                                    case 'a': weight += (i + 1) * lettersNumbers[0]; break;
                                    case 'b': weight += (i + 1) * lettersNumbers[1]; break;
                                    case 'c': weight += (i + 1) * lettersNumbers[2]; break;
                                    case 'd': weight += (i + 1) * lettersNumbers[3]; break;
                                    case 'e': weight += (i + 1) * lettersNumbers[4]; break;
                                }
                            }

                            if (weight >= start && weight <= end)
                            {
                                noFSl = false;
                                output += "" + letters[e] + letters[d] + letters[c] + letters[b] + letters[а] + " ";
                            }
                        }
                        lettersList.Clear();
                    }
                }
            }
        }
        if (noFSl == true)
        {
            Console.WriteLine("No");
        }
        else
        {
            Console.WriteLine(output);
        }
    }
}