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import sys
unique = len(sys.argv) > 1 and sys.argv[1] == '-u'
files = sys.argv[2:] if unique else sys.argv[1:]
mails = []
if files:
for f in files:
mails.extend(open(f).read().splitlines())
else:
mails.extend(sys.stdin.read().splitlines())
mails = [mail.split("@") for mail in mails]
if unique:
mails = {(name, domain.lower()) for name, domain in mails}
mails = sorted(mails,key=lambda pair: (pair[1].lower(), pair[0]))
print("\n".join(f"{name}@{domain}" for name, domain in mails))
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