def verify_gender(gender_input: str) -> bool:
    """
    A helper function to make verifying gender strings easier

    Parameters
    ----------
    gender_input: str
        The single letter gender string to be verified.
        Valid inputs are: 'm', 'f', 'o'

    Returns
    ----------
    bool: Returns true if the gender string is a valid gender
    """
    return bool(
        gender_input.lower() == "m"
        or gender_input.lower() == "f"
        or gender_input.lower() == "o"
    )