syntax error python introduction if elif else

what's wrong with this code? I wrote this in python 3.6 IDLE. i get a syntax error.

>>> age = int(input("How old are you: "))

>>> if age <= 18:
    print("Thanks for shopping!")
elif age in range(16, 18):
    print("I'm not allowed to sell you strong alholic beverages!")
else:
    print("I'm not allowed to sell you alcohol, nor cigarettes")