#include <bits/stdc++.h>
using namespace std;

int main(void) {
    string s;
    cin>>s;
    string t = "kyoprotenkei90";
    map<char, int> mp;
    for (auto c : t) mp[c]++;
    for (auto c : s) mp[c]--;
    
    bool flg = true;
    for (auto p : mp) {
        flg &= p.second == 0;
    }
    
    if (flg) puts("Yes");
    else puts("No");
}