import logging

# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s [%(levelname)s] %(name)s - %(message)s",
)
logger = logging.getLogger(__name__)

def __main__(probability:float):
    logger.info("Received input: probability=%.8f", float(probability))
    
    if not isinstance(probability, (int, float)):
        logger.error("Invalid input type: probability=%s", type(probability).__name__)
        raise ValueError("Input probability must be a number (int or float)")
    
    if probability <= 0.219999999999999:
        grade = "A1"
    elif 0.219999999999999 < probability <= 0.339999999999999:
        grade = "A2"
    elif 0.339999999999999 < probability <= 0.419999999999999:
        grade = "B1"
    elif 0.419999999999999 < probability <= 0.514999999999999:
        grade = "B2"
    elif 0.514999999999999 < probability <= 0.559999999999999:
        grade = "C1"
    else:
        grade = "C2"

    logger.info(f"PD V1 Grade {grade}")
    
    return {"grade":grade}