Does it even differentiate between lowercase and uppercase letters?
Results for me were:
> How long is a piece of string, when the string is 4km long?
4096 meters.
> How long is a piece of string, when the string is 4Kim long?
4Kim
> How long is a piece of string, when the string is 4Km long?
4096 meters.
after that I got the "Something went wrong, please try again." error.