#!/usr/bin/env python3
# from typing import *

import sys
import io
import math
import collections
import decimal
import itertools
import bisect
import heapq


def input():
    return sys.stdin.readline()[:-1]


# sys.setrecursionlimit(1000000)

# _INPUT = """# paste here...
# """
# sys.stdin = io.StringIO(_INPUT)

INF = 10**10

YES = 'Yes'
NO = 'No'

def solve(S):
    if len(S) != len('kyoprotenkei90'):
        return 'No'

    counter1 = collections.Counter(S)
    counter2 = collections.Counter(list('kyoprotenkei90'))
    for c, n in counter1.items():
        if c not in counter2 or counter2[c] != n:
            return 'No'
    return 'Yes'


S = input()
print(solve(S))