MagicLetter

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {

            char startLetter = char.Parse(Console.ReadLine());
            char endLetter = char.Parse(Console.ReadLine());
            char magicLetter = char.Parse(Console.ReadLine());


            for(char firstLetter = startLetter; firstLetter <= endLetter; firstLetter++)
            {
                for(char secondLetter = startLetter; secondLetter <= endLetter; secondLetter++)
                {
                    for(char thirdLetter = startLetter; thirdLetter <= endLetter; thirdLetter++)
                    {
                        String word = "" + firstLetter + secondLetter + thirdLetter;
                        if (!word.Contains(magicLetter))
                        {
                            Console.Write(word + " ");
                        }
                    }
                }
            }

        }
    }
}