#!/usr/bin/env python3
"""Extract all URLs from text using regex."""
import re
import sys

def extract_urls(text: str) -> list[str]:
    """Extract HTTP/HTTPS URLs from text.
    
    Returns a list of unique URLs preserving order of first appearance.
    """
    url_pattern = r'https?://(?:[-\w.]|(?:%[\da-fA-F]{2}))+[^\s\'"<>)]*'
    matches = re.findall(url_pattern, text)
    seen = set()
    result = []
    for url in matches:
        clean = url.rstrip('.,;:!?)')
        if clean not in seen:
            seen.add(clean)
            result.append(clean)
    return result

if __name__ == '__main__':
    input_text = sys.stdin.read() if not sys.argv[1:] else ' '.join(sys.argv[1:])
    urls = extract_urls(input_text)
    for url in urls:
        print(url)