1. T
2. h
3. a
4. n
5. k
6. s
7. !
8. !
9. !
10. !
It's no good chief, we can't stretch the word "Thanks" to ten characters without using a juvenile amount of unnecessary exclamation points!
In all seriousness though, I like this idea. Having the limit to prevent spam is a good thing, but having to write [filler] so much is annoying. Or you could make it so that the word "Thanks" bypasses the character limit.