import sys
#from numba import jit
#import collections
#import math
#sys.setrecursionlimit(200000)

input_methods=['clipboard','file','key']
using_method=0
input_method=input_methods[using_method]

tin = lambda : map(int, input().split())
lin = lambda : list(tin())
MOD = 1000000007
INF = 10**12

#+++++
#for copy from lib


#+++++

def main():
	#n = int(input())
	#a,b,c = tin()
	s=input()
	s=[c for c in s]
	aa='kyoprotenkei90'
	aa=[c for c in aa]
	s.sort()		
	aa.sort()
	if s==aa:
		return 'Yes'
	return 'No'
		
#+++++
isTest=False

def pa(*vl):
	if not isTest:
		return
	#for v in vl:
	print(vl)
		
def input_clipboard():
	import clipboard
	input_text=clipboard.get()
	input_l=input_text.splitlines()
	for l in input_l:
		yield l

if __name__ == "__main__":
	if sys.platform =='ios':
		if input_method==input_methods[0]:
			ic=input_clipboard()
			input = lambda : ic.__next__()
		elif input_method==input_methods[1]:
			sys.stdin=open('inputFile.txt')
		else:
			pass
		isTest=True
	else:
		pass
		#input = sys.stdin.readline
			
	ret = main()
	if ret is not None:
		print(ret)