namespace MagicWand
{
    using System;
    using System.Linq;

    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();

            var paramArgs = input.Split('\\');
            string firstString = paramArgs[0];
            string secondString = paramArgs[1];
            string command = paramArgs[2];

            string output = string.Empty;

            switch (command)
            {
                case "join":
                    output = Join(firstString, secondString, output);
                    break;

                case "right exclude":
                    output = RightExclude(firstString, secondString, output);
                    break;

                case "left exclude":
                    output = LeftExclude(secondString, firstString, output);
                    break;
            }

            char[] finalOutput = output.ToCharArray();
            Array.Sort(finalOutput);
            Print(finalOutput);
        }

        private static string LeftExclude(string secondString, string firstString, string output)
        {
            for (int i = 0; i < secondString.Length; i++)
            {
                if (!firstString.Contains(secondString[i]))
                {
                    output += secondString[i];
                }
            }
            return output;
        }

        private static void Print(char[] finalOutput)
        {
            for (int i = 0; i < finalOutput.Length; i++)
            {
                Console.Write(finalOutput[i]);
            }

           // Console.WriteLine();
        }

        private static string RightExclude(string firstString, string secondString, string output)
        {
            for (int i = 0; i < firstString.Length; i++)
            {
                if (!secondString.Contains(firstString[i]))
                {
                    output += firstString[i];
                }
            }
            return output;
        }

        private static string Join(string firstString, string secondString, string output)
        {
            for (int i = 0; i < firstString.Length; i++)
            {
                for (int j = 0; j < secondString.Length; j++)
                {
                    if (firstString[i] == secondString[j])
                    {
                        output += firstString[i];
                    }
                }
            }

            return output;
        }
    }
}