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());
        int counterb = 0;
        //'a', 'b', 'c', 'd', 'e'
        //weight('a') = 5; weight('b') = -12;  weight('c') = 47;  weight('d') = 7;  weight('e') = -32.
        //1*weight('b') + 2*weight('c') + 3*weight('d')
        char[] letters = { 'a', 'b', 'c', 'd', 'e' };
        // List<char> sequence = new List<char>();
        char[] sequence = new char[5];
        int sum = 0;
        int b = 1;
        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++)
                        {
                            sequence[0] = letters[i1];
                            sequence[1] = letters[i2];
                            sequence[2] = letters[i3];
                            sequence[3] = letters[i4];
                            sequence[4] = letters[i5];
                            sequence.OrderBy(a => 'c');//.ToArray();
                            char[] resource = sequence.Distinct().ToArray();
                            b = 0;
                            for (int i = 0; i < resource.Length; i++)
                            {
                                b++;
                                switch (resource[i])
                                {
                                    case 'a': sum += 5 * b; continue;
                                    case 'b': sum += -12 * b; continue;
                                    case 'c': sum += 47 * b; continue;
                                    case 'd': sum += 7 * b; continue;
                                    case 'e': sum += -32 * b; continue;


                                    default: sum += 0;
                                        break;
                                }

                            }
                            if (sum >= start && sum <= end)
                            {

                                Console.Write("{0}{1}{2}{3}{4} ", sequence[0], sequence[1], sequence[2], sequence[3], sequence[4]);
                                //counterb++;
                            }
                            else
                            {
                                sum = 0;
                            }
                        }
                    }
                }
            }
        }
        if (counterb == 0)
        {
            Console.WriteLine("No");
        }
    }
}