The "num" variable is not a number, it *is* a string. Just because you call it "num" doesn't magically turn it into a number. The `input` function returns a string.

You might be thinking of Python 2.7 where `input` automatically evaluated the string as Python code. Python 3 does not do that. If you want to convert the string result of `input` to be a float or an int or some other type, you need to call the `float` or `int` functions.