#include<iostream>
#include<cassert>
#define rep(i,n) for(i=0;i<(int)(n);i++)
#define ASCII 256
using namespace std;
typedef long long ll;
typedef unsigned long long ull;

string s,t="kyoprotenkei90";
int alpha[ASCII]={0},t_alpha[ASCII]={0};

int main(){
    int i,j;
    cin>>s;
    rep(i,s.length())alpha[(int)s[i]]++;
    rep(i,t.length())t_alpha[(int)t[i]]++;
    rep(i,ASCII)if(alpha[i]!=t_alpha[i])break;
    printf("%s\n",i==ASCII?"Yes":"No");
    return 0;
}