using System;


        public class Program
        {
            static string F(string X)
            {
                if (X.Length > 1)
                {
                    string T = X.Substring(1);
                    switch (X.Substring(0,1))
                    {
                        case "0":
                            return T;
                        case "1":
                            return F(T) + '0' + F(T);
                        default:
                            return F(X);
                    }


                }
                else
                {
                    return (F(X));
                }
            }
            public static void Main(string[] args)
            {
                while (true)
                {
                    Console.Write("X=");
                    Console.WriteLine("F(x)=" + F(Console.ReadLine()));
                }
			}
}