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

namespace Test
{
    class Program
    {
        static void Main(string[] args)
        {
            var startLetter = char.Parse(Console.ReadLine());
            var endLetter = 'a';
            int count = 0;

            while(endLetter <= startLetter)
            {
                if(startLetter == 'z')
                {
                    endLetter = 'z';
                    break;
                }
                endLetter = char.Parse(Console.ReadLine());
            }

            var exceptLetter = char.Parse(Console.ReadLine());

            for (char i = startLetter; i <= endLetter; i++)
            {
                if(i != exceptLetter)
                {
                    for (char j = startLetter; j <= endLetter; j++)
                    {
                        if (j != exceptLetter)
                        {
                            for (char k = startLetter; k <= endLetter; k++)
                            {
                                if (k != exceptLetter)
                                {
                                    Console.Write($"{i}{j}{k} ");
                                    count++;

                                }
                            }
                        }
                    }
                }
            }
            Console.WriteLine(count);
        }
    }
}