S = input()

target = "kyoprotenkei90"
for i in range(len(S)):
    if (S[i] in target):
        idx = target.index(S[i])
        target = target[:idx]+target[idx+1:]
    else:
        print("No")
        exit()

if (len(target) == 0):
    print("Yes")
else:
    print("No")