#!/usr/bin/env python3

from urllib.parse import urlsplit
import sys

if len(sys.argv) != 2:
    print(f"Usage: {sys.argv[0]} <url>")
    raise SystemExit(1)

url = sys.argv[1]
parsed = urlsplit(url)

if parsed.hostname is None:
    print(f"No host name found in URL: {url}")
    raise SystemExit(1)

print(parsed.hostname)