#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
#include <cmath>
#include <map>
#include <queue>
#include <string>
#include <string.h>

#define reps(i,s,n) for(int (i) = (s); (i) < (n); (i)++)
#define rep(i,n) reps(i,0,n)
using namespace std;
using ll = long long;
using pii = pair<int,int>;
using vi = vector<int> ;
using vl = vector<ll>;

int main(){
    map<char,int> mp;
    string s;
    cin >> s;
    string tmp = "kyoptotenkei90";
    rep(i,14){
        mp[s[i]]++;
    }
    rep(i,14){
        if(mp[tmp[i]] == 0){
            cout << "No" << endl;
            return 0;
        }
    }
    
    cout << "Yes" << endl;
    return 0;
}