extract_email_finditter

import re

text = input()
pattern = r"(^|(?<=\s))([a-z0-9]+[\.\-\_a-z]*)@([a-z\-]+)(\.[a-z]+)+\b"
emails = re.finditer(pattern, text)
for email in emails:
    current_email = email.group()
    print(current_email)