S=input()
d={i:0 for i in set("kyoprotenkei90")}
d2={i:0 for i in set(S)}
for c in "kyoprotenkei90":
    d[c]+=1
for c in S:
    d2[c]+=1
for i,j in zip(sorted(d.items()),sorted(d2.items())):
    if tuple(i)!=tuple(j):print("No");exit()
print("Yes")