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 Kotlin (1.3.71) (judge verdict: Accepted)

fun main(args: Array<String>) {
    val day = readLine()?.toInt()
    //?.（セーフコール演算子）
    //readLineメソッドの戻り値はnull許容型（String?）である

    when {
        day == 22 -> println("Christmas Eve Eve Eve")
        day == 23 -> println("Christmas Eve Eve")
        day == 24 -> println("Christmas Eve")
        day == 25 -> println("Christmas")
    }

}