using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
class FiveSpecialLetters
{
    static void Main()
    {
        int start = int.Parse(Console.ReadLine());
        int end = int.Parse(Console.ReadLine());
        char[] letters = { 'a', 'b', 'c', 'd', 'e' };
        int weight = 0;
        int b = 1;
        int a = 0;
        int counter = 0;
        //List<char> combination = new List<char>(5);
        char[] combination = new char[5];
        for (int i1 = 0; i1 < 5; i1++)
        {
            for (int i2 = 0; i2 < 5; i2++)
            {
                for (int i3 = 0; i3 < 5; i3++)
                {
                    for (int i4 = 0; i4 < 5; i4++)
                    {
                        for (int i5 = 0; i5 < 5; i5++)
                        {
                            // List<char> combination = new List<char>();
                            combination[0] = letters[i1];
                            combination[1] = letters[i2];
                            combination[2] = letters[i3];
                            combination[3] = letters[i4];
                            combination[4] = letters[i5];
                            //    combination
                            //  combination.Distinct();
                            b = 0;
                            a = 0;
                            char[] q = combination.Distinct().ToArray();
                            for (int i = 0; i < q.Length; i++)
                            {
                                b++;

                                switch (q[i])
                                {

                                    case 'a': a += 5 * b; continue;
                                    case 'b': a += -12 * b; continue;
                                    case 'c': a += 47 * b; continue;
                                    case 'd': a += 7 * b; continue;
                                    case 'e': a += -32 * b; continue;
                                    default:
                                        break;
                                }

                            }
                            if (a >= start && a<= end)
                            {
                                Console.Write("{0}{1}{2}{3}{4} ", combination[0], combination[1], combination[2], combination[3], combination[4]);
                                counter++;
                            }
                        }
                    }
                }
            }
        }
        if (counter ==0)
        {
            Console.WriteLine("No");
        }
    }
}