Practice

using System;

class MainClass 
{
    public static string Decode(string a)
    {
		string newString = a.Replace(".", string.Empty);
		try{
			int number = Int32.Parse(newString);
			if(number < 1025) return number.ToString();
			else return (number%1024).ToString();
		}catch(Exception e){
			//Console.WriteLine("{0} Exception caught.", e);
			return "Error";
		}
    }

    public static void Main() 
    {
        Console.WriteLine(Decode(""));
    }
}