How remove all non-alphabet chars excluding white space from string in Python without joining the words

I have a variable named para and I want to remove all the non-alphabet characters excluding whitespace characters. For the following input:

para = "I a, going #?5 1throu$gh Lots Of ]pain
        kcb H in"

required output

para =  "I a going through Lots Of pain
        kcb H in"

Code Tried

import re
regex = re.compile('[^a-zA-Z]')
regex.sub('', para)

Output getting

'IagoingthroughLotsOfpain'

>Solution :

import re
regex = re.compile('[^a-zA-Z\s]')
regex.sub('', para)

\s matches any whitespace character (equivalent to [\r\n\t\f\v ]). See regex101.com.