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 rec f d = match d with
  | 0 -> "Christmas"
  | _ -> f (d-1) ^ " Eve"
let () =
  Scanf.scanf "%d\n" (fun d -> f (25-d)) |> print_string