s = input()
p = "kyoprotenkei90"
for i in range(14):
    if not (s[i] in p):
        print("No")
        exit()
    if i == 13:
        if s.count("o") == s.count("e") == 2 == s.count("k"):
            print("Yes")
        else:
            print("No")
        j