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 OCaml (4.02.3) (judge verdict: Accepted)

let calc = function
  | 25 -> "Christmas"
  | 24 -> "Christmas Eve"
  | 23 -> "Christmas Eve Eve"
  | 22 -> "Christmas Eve Eve Eve"
  | n  -> string_of_int n

let () =
  let n = Scanf.scanf "%d" (fun n -> n) in
  calc n |> print_endline