class Logger():
    def debug(self, message: str) -> None:
        print(message)

    def info(self, message: str) -> None:
        print(message)

    def warn(self, message: str) -> None:
        print(message)

    def error(self, message: str) -> None:
        print(message)

LOGGER = Logger()

def set_logger(logger: Logger) -> None:
    global LOGGER
    LOGGER = logger

def debug(message: str) -> None:
    global LOGGER
    LOGGER.debug(message)

def info(message: str) -> None:
    global LOGGER
    LOGGER.info(message)

def warn(message: str) -> None:
    global LOGGER
    LOGGER.warn(message)

def error(message: str) -> None:
    global LOGGER
    LOGGER.error(message)