mathparse and mathematical evaluation

[AskellAytch]

Question: Is the code eighteen hundred and twenty-one?

Result in a fatal error

Explanation: in eighteen (and sixteen, seventeen, and all that jazz) chatterbot sees EIGHT first
hence turning "eighteen" in "8een"
hence the keyword error.

Solution i found: in the file mathwords.py (of the library mathparse), add a space ' ' after each number raising an issue (four, six, seven, eight, nine) to force chatterbot to see the difference bewteen eight and eighteen.

Haven't invistigate further for other language nor other mathematical evaluation.

Hope it will help whoever reads this.

Cheers