FiveSpecialLetters

using System;
using System.Linq;
using System.Text;

class FiveSpecialLetters
{

    static void Main(string[] args)
    {
        //weight in range(incl.)
        int start = int.Parse(Console.ReadLine());
        int end = int.Parse(Console.ReadLine());

        //make an array to be used
        int[] arrParams = new int[5] { 5, -12, 47, 7, -32 };
        int weight = 0;
        //common place to be stored results
        StringBuilder result = new StringBuilder();

        for (int f = 0; f < 5; f++)
        {
            for (int s = 0; s < 5; s++)
            {
                for (int t = 0; t < 5; t++)
                {
                    for (int fourth = 0; fourth < 5; fourth++)
                    {
                        for (int fifth = 0; fifth < 5; fifth++)
                        {
                            int[] generateSequence = new int[] { arrParams[f], arrParams[s],
                                    arrParams[t], arrParams[fourth], arrParams[fifth] };
                            int[] cleanNumbers = generateSequence.Distinct().ToArray();
                            for (int i = 0; i < cleanNumbers.Length; i++)
                            {
                                weight += (i + 1) * cleanNumbers[i];
                            }
                            if (weight >= start && end >= weight)
                            {
                                for (int valueInArr = 0; valueInArr < 5; valueInArr++)
                                {
                                    switch (generateSequence[valueInArr])
                                    {
                                        case 5: result.Append('a'); break;
                                        case -12: result.Append('b'); break;
                                        case 47: result.Append('c'); break;
                                        case 7: result.Append('d'); break;
                                        case -32: result.Append('e'); break;
                                    }
                                }
                                result.Append(" ");
                            }
                            weight = 0;
                        }
                    }
                }
            }
        }
        if (result.Length == 0)
        {
            Console.WriteLine("No");
        }
        else
        {
            Console.WriteLine(result);
        }
    }
}