>>> def even_or_odd(n):
...     if(n%2==0):
...             print("even")
...     else:
...             print("odd")
...
>>> even_or_odd(10)
even
>>> even_or_odd(09)
  File "<stdin>", line 1
   even_or_odd(09)
             ^
SyntaxError: invalid token
>>> even_or_odd(9)
odd