#include <bits/stdc++.h>
#define rep(i,a,b) for(int i = (a); i < (b); i++)
#define all(A) (A).begin(),(A).end()
#define MOD 1000000007
using namespace std;
using ll = long long;
using Graph = vector<vector<int>>;

int main(void){
	string s; cin >> s;
	string anss = "kyoprotenkei90";
	map<char,int> MA,M;
	rep(i,0,14) MA[anss[i]]++;
	rep(i,0,(int)s.size()) M[s[i]]++;

	for(auto& [k,v] : MA){
		if(v > M[k]){
			cout << "No";
			return 0;
		}
	}
	cout << "Yes";
}