Satu huruf kecil tiga pengawal besar
import re
print ''.join(re.findall('[^A-Z][A-Z]{3}([a-z])[A-Z]{3}[^A-Z]', open("data.txt").read()))
Lively Ladybird
import re
print ''.join(re.findall('[^A-Z][A-Z]{3}([a-z])[A-Z]{3}[^A-Z]', open("data.txt").read()))