You've got a bunch of textual data with embedded phone numbers. Write a function `area_code()` that finds and returns just the area code portion of the phone number.
```python
>>> message = "The supplier's phone number is (555) 867-5309"
>>> area_code(message)
'555'
```
The returned area code should be a string, not a number.
Every phone number is formatted like in the example, and the only non-alphanumeric characters in the string are apostrophes `'` or the punctuation used in the phone number.
import re

def area_code(text):
    return re.search(r'\((\d{3})\)',text).group(1)
import re

def area_code(text):
    return re.search(r'\((\d{3})\)',text).group(1)