#!/usr/bin/env python3
"""Palindrome checker - returns 0 if palindrome, 1 otherwise."""
import sys

def is_palindrome(s: str) -> bool:
    """Check if string is palindrome (ignoring case, non-alphanumeric)."""
    cleaned = ''.join(c.lower() for c in s if c.isalnum())
    return cleaned == cleaned[::-1]

if __name__ == '__main__':
    if len(sys.argv) < 2:
        print("Usage: python3 palindrome.py <string>")
        sys.exit(2)
    result = is_palindrome(sys.argv[1])
    print(f"{sys.argv[1]!r} is {'a palindrome' if result else 'not a palindrome'}")
    sys.exit(0 if result else 1)