to use both `B_SYS` and `E_SYS` use the following:
        ```python
        >>> from transformers import Conversation

        >>> Conversation(
        ...     "<<SYS>>\n Complete the functions without any documentation\n<</SYS>>\n\n `def remove_non_ascii(s: str) -> str:`"
        ... )  # doctest: +IGNORE_RESULT
        ```
        Args:
            conversation (`Conversation`):
                Conversation to build input ids for.
        Returns:
            `List[int]`:
                Input ids for the conversation.
        r