using System;

public class Program

{

    public static void Main()

    {

        string textValue = "00011001001110";

        string textKey = "141286604803370";

      Console.WriteLine ((Convert.ToInt32(textValue, 2) ^ int.Parse(textKey.Substring(textKey.Length - 4))).ToString().PadLeft(4, '0'));

    }

}