from sys import exit


def main() -> int:
    # Perform operations
    print("Hello world!")

    # Finish with no errors
    return 0


if __name__ == "__main__":
    exit(main())

from sys import exit


def main() -> int:
    # Perform operations
    print("Hello world!")

    # Finish with no errors
    return 0


if __name__ == "__main__":
    exit(main())

# Perform operations # Finish with no errors