using System;

public class HalloweenOrChristmas

{

  public int d;

  public string m;

}

public class Program

{

    public static void Main()

    {

        HalloweenOrChristmas hoc = new HalloweenOrChristmas();

        Console.Write("Enter month:");

        hoc.m = Convert.ToString(Console.ReadLine());

        Console.Write("Enter plate day:");

        hoc.d = int.Parse(Console.ReadLine());

        if (hoc.m == "OCT" || hoc.m== "oct") 

        {

          if( hoc.d == 31 ){

          Console.WriteLine("Halloween");

        }}

        else if (hoc.m == "DEC" || hoc.m == "dec")

        {

            if (hoc.d == 25) {

            Console.WriteLine("Christmas");

        }}

        else

        {

            Console.WriteLine("None");

        }

    }

}