#!/usr/bin/env python3
"""Word frequency counter - counts and sorts unique words in text files."""
import sys
from collections import Counter
import re

def count_words(text):
    """Extract words and count frequencies."""
    words = re.findall(r'\b[a-zA-Z]+\'?[a-zA-Z]*\b', text.lower())
    return Counter(words)

def main():
    if len(sys.argv) < 2:
        print("Usage: wordfreq.py <file>", file=sys.stderr)
        sys.exit(1)
    
    with open(sys.argv[1], 'r') as f:
        text = f.read()
    
    counts = count_words(text)
    
    for word, count in sorted(counts.items(), key=lambda x: (-x[1], x[0])):
        print(f"{count:6d} {word}")

if __name__ == '__main__':
    main()