Letters_Combinations

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

namespace Letters_Combinations
{
    class Program
    {
        static void Main(string[] args)
        {
            char letterStart = char.Parse(Console.ReadLine());
            char letterEnd = char.Parse(Console.ReadLine());
            char letterMiss = char.Parse(Console.ReadLine());
            int printCount = 0;
            for (char i = letterStart; i <= letterEnd; i++)
            {
                if (i == letterMiss)
                {
                    continue;
                }
                for (char j = letterStart; j <= letterEnd; j++)
                {
                    if (j == letterMiss)
                    {
                        continue;
                    }
                    for (char k = letterStart; k <= letterEnd; k++)
                    {
                        if (k == letterMiss)
                        {
                            continue;
                        }
                        Console.Write("{0}{1}{2} ", i, j, k);
                        printCount++;
                    }
                }
            }
            Console.Write(printCount);
        }
    }
}