using System;

public class Program

{

    interface IReader {

        string ReadAll();

        string ReadLine();

        bool ReadFinish();

    }

    class ConsoleReader: IReader {

        bool isFinish = false;

        public string ReadLine() {

            string line = Console.ReadLine();

            if (line != string.Empty)

        }

    }

    public static void Main()

    {

    }

}