I'm on this part of the Python course:

*Functions**Parameters and Arguments*

https://www.codecademy.com/courses/python-beginner-c7VZg/1/3?curriculum_id=4f89dab3d788890003000096

And this is the code I have written

```
base = raw_input("Gimme some base: ")
exponent = raw_input("Now some exponent: ")
def power(base,exponent): # Add your parameters here!
result = base**exponent
print "%d to the power of %d is %d." % (base, exponent, result)
power(base,exponent) # Add your arguments here!
```

Yet I got this error message:

"unsupported operand type(s) for ** or pow(): 'unicode' and 'unicode' "

Pls, help!

Thanks very much!