## Overview
This block (`block.py`) is responsible for assigning grades.

## Key Inputs & Outputs
- **Request**: Refer to `request_schema.json` for detailed input fields and validation rules.  
- **Response**: Refer to `response_schema.json` for the returned structure and data types.

## Implementation Details
- All core logic resides in `block.py` within the `__main__` function.
- Example usage and validation are demonstrated in `test_block.py`.