s=list(input())
lis=["y","p","r","t","i","9","0"]
lis1=["k","o","e"]
for i in lis:
    if s.count(i)!=1:
        print("No")
        exit()
for i in lis1:
    if s.count(i)!=2:
        print("No")
        exit()
print("Yes")