def IsDash(s: str, index: int) -> bool:
    """Verifies that character at index of string is '-'.

    Args:
        s     (str): 
            string to be examined.
        index (int):
            starting index of the possible '-' character.

    Return:
        (boolean): true or false to if the value is valid.
    """

    return s[index:index + 1] == '-'