import sys

sys.setrecursionlimit(10 ** 6)
stdin = sys.stdin

ni = lambda: int(ns())
na = lambda: list(map(int, stdin.readline().split()))
ns = lambda: stdin.readline().strip()
nsa = lambda: list(map(str, stdin.readline().split()))
ntp = lambda: tuple(map(int, stdin.readline().split()))
mod = 10 ** 9 + 7
inf = 10 ** 18

S = ns()

T = 'kyoprotenkei90'

ansdict = {}
for t in T:
    if t in ansdict:
        ansdict[t] += 1
    else:
        ansdict[t] = 1

dict = {}
for s in S:
    if s in dict:
        dict[s] += 1
    else:
        dict[s] = 1

ok = True
for t in ansdict.keys():
    if t in dict:
        if dict[t] == ansdict[t]:
            continue
    ok = False

if ok:
    print('Yes')
else:
    print('No')