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 C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include<iostream>
#include<algorithm>
#include<vector>
#include<string>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<limits>
#include<iomanip>
#include<cmath>
#include<climits>
using namespace std;

#define rp(i,n) for(int i=0;i<n;i++)
#define rep(i,m,n) for(int i=m;i<=n;i++)
#define llrp(i,n) for(long long i=0;i<n;i++)
#define llrep(i,m,n) for(long long i=m;i<=n;i++)
#define sort(a) sort(a.begin(),a.end())
#define reverse(a) reverse(a.begin(),a.end())
#define pb push_back
#define elif else if
#define vcin(a); rp(i,a.size()){cin>>a[i];}
#define vcout(a); rp(i,a.size()){cout<<a[i]<<endl;}
#define allchar(c) for(char c='a';c<='z';c++)

typedef vector<int> vi;
typedef vector<long long> vll;
typedef vector<string> vs;
typedef vector<char> vc;
typedef vector<bool> vb;
typedef long long ll;
typedef string S;
typedef pair<int,int> P;
typedef queue<int> qi;

const int mod=1e9+7;

ll modpow(ll a,ll b,ll p){
    if(b==0){
        return 1;
    }elif(b%2==0){
        return modpow((a*a)%p,b/2,p);
    }else{
        return (a*modpow(a,b-1,p))%p;
    }
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    int d;
    cin >> d;
    if(d==25){
        cout << "Christmas" << endl;
    }elif(d==24){
        cout << "Christmas Eve" << endl;
    }elif(d==23){
        cout << "Christmas Eve Eve" << endl;
    }elif(d==22){
        cout << "Christmas Eve Eve Eve" << endl;
    }
    return 0;
}