#include <bits/stdc++.h>

using namespace std;
#define rep(i, n, o) for(int i = o;i < (n);i++)
#define ou(x) cout << x << endl
#define ll long long
#define re return 0

int main(){
    string s, ch = "kyoprotenkei90";
    map<char, int> mp;
    map<char, int> m;
    cin >> s;
    rep(i, s.length(), 0){
        mp[s[i]]++;
    }
    rep(i, ch.length(), 0){
        m[ch[i]]++;
    }
    if(m == mp) ou("Yes");
    else ou("No");
    re;
}