from collections import defaultdict
S = list(input())
d = defaultdict(lambda:0)
X = list("kyoprotenkei90")
for v in S:
    d[v] += 1
for v in X:
    d[v] -= 1
ans = "Yes"
for v in d.keys():
    if d[v] != 0:
        ans = "No"
print(ans)