letterCombinacion

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

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            char a = char.Parse(Console.ReadLine());
            char b = char.Parse(Console.ReadLine());
            char c = char.Parse(Console.ReadLine());
            int combination = 0;
            for (char i=a; i<=b; i++)
            {
                for (char j=a; j<=b; j++)
                {
                    for (char k=a; k<=b; k++)
                    {
                        if (i != c && j != c && k!=c)
                        {
                            Console.Write("{0}{1}{2} ", i, j, k);
                            combination++;
                        }
                    }
                }
            }
          Console.Write(combination+" ");
        }
    }
}