What is wrong with this code?

Question

def work(rank):
def plus(num):
print("***")
rank(num)
print("***")
print("END OF PAGE")
return plus
@decor
def invoice(num):
print("INVOICE #:" +num)
invoice(input())# for help: something with @decor

Answer 1

def work(rank):
def plus(num):
print("***")
rank(num)
print("***")
print("END OF PAGE")
return plus

@work
def invoice(num):
print("INVOICE #:", num)
invoice(33)

Answer 2

Thank you