using System;

​

public class Program

{

    public static void Main()

    {

        string i = Console.ReadLine();

        if (i == "Monday")

        {

            Console.WriteLine("Work day");

        }

        else if (i == "Tuesday")

        {

            Console.WriteLine("Work day");

        }

        else if (i == "Wednesday")

        {

            Console.WriteLine("Work day");

        }

        else if (i == "Thursday")

        {

            Console.WriteLine("Work day");

        }

        else if (i == "Friday")

        {

            Console.WriteLine("Work day");

        }

        else if (i == "Saturday")

        {

            Console.WriteLine("Weekend");

        }

        else if (i == "Sunday")

        {

            Console.WriteLine("Weekend");

        }

        else if (i == "April")

        {

            Console.WriteLine("Error");

        }

    }

}