Problem:
Score : 100 points

Problem Statement

In some other world, today is December D-th.

Write a program that prints Christmas if D = 25, Christmas Eve if D = 24, Christmas Eve Eve if D = 23 and Christmas Eve Eve Eve if D = 22.

Constraints

22 \leq D \leq 25

D is an integer.

Input

Input is given from Standard Input in the following format:

D

Output

Print the specified string (case-sensitive).

Sample Input 1

25

Sample Output 1

Christmas

Sample Input 2

22

Sample Output 2

Christmas Eve Eve Eve

Be sure to print spaces between the words.

Solution in Scala (2.11.7) (judge verdict: Accepted)

import java.io.{PrintWriter, _}
import java.util
import java.util._

import scala.collection.mutable


object Main {
  def main(args: Array[String]): Unit = {
    val inputStream = System.in
    val outputStream = System.out
    val in = new InputReader(inputStream)
    val out = new PrintWriter(outputStream)
    val solver = new Task
    solver.solve(1, in, out)
    out.close()
  }

  def ?(item: Boolean, first: Object, second: Object): Object = if (item) first else second
  
  class Task {
    def solve(testNumber: Int, in: InputReader, out: PrintWriter): Unit = {
      val n = in.nextInt
      val map = mutable.HashMap(25 -> "Christmas", 24 -> "Christmas Eve", 23 -> "Christmas Eve Eve",
        22 -> "Christmas Eve Eve Eve")
      out.println(map(n))
    }
  }


  class InputReader(val stream: InputStream) extends AutoCloseable {
    //reader = new BufferedReader(new FileReader(stream), 32768);
    private val reader = new BufferedReader(new InputStreamReader(stream), 32768)
    private var tokenizer = new StringTokenizer("")


    def next: String = {
      while ( {
        tokenizer == null || !tokenizer.hasMoreTokens
      }) try
        tokenizer = new StringTokenizer(reader.readLine)
      catch {
        case e: IOException =>
          throw new RuntimeException(e)
      }
      tokenizer.nextToken
    }

    def nextLine: String = {
      try
        return reader.readLine
      catch {
        case e: IOException =>
          e.printStackTrace()
      }
      ""
    }

    def nextInt: Int = next.toInt

    def nextLong: Long = next.toLong

    override def close(): Unit = {
    }
  }

}