04. Morse Code Numbers

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

class Program
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        int sum = 0;
        int firstDigit = n / 1000;
        int secondDigit = (n / 100) % 10;
        int thirdDigit = (n / 10) % 10;
        int fourthDigit = n % 10;
        sum = firstDigit + secondDigit + thirdDigit + fourthDigit;

        int one = 0;
        int two = 0;
        int three = 0;
        int four = 0;
        int five = 0;
        int six = 0;
        bool sequenceFound = false;

        for (int i = 0; i < 6; i++)
        {
            one = i;
            for (int j = 0; j < 6; j++)
            {
                two = j;
                for (int k = 0; k < 6; k++)
                {
                    three = k;
                    for (int m = 0; m < 6; m++)
                    {
                        four = m;
                        for (int o = 0; o < 6; o++)
                        {
                            five = o;
                            for (int p = 0; p < 6; p++)
                            {
                                six = p;
                                int product = one * two * three * four * five * six;
                                if (product == sum)
                                {
                                    sequenceFound = true;
                                    string result = "" + one + two + three + four + five + six;
                                    foreach (char digit in result)
                                    {
                                        switch (digit)
                                        {
                                            case '0': Console.Write("-----|"); break;
                                            case '1': Console.Write(".----|"); break;
                                            case '2': Console.Write("..---|"); break;
                                            case '3': Console.Write("...--|"); break;
                                            case '4': Console.Write("....-|"); break;
                                            case '5': Console.Write(".....|"); break;
                                            default: break;
                                        }

                                    }
                                    Console.WriteLine();
                                }
                            }
                        }
                    }
                }
            }
        }
        if (sequenceFound == false)
        {
            Console.WriteLine("No");
        }
    }
}