This is a clever use of exceptions, though I would avoid this in production code. Raising exceptions is costly, and also if "a" happens to be a long string you would be creating a string 50 times larger.

good use!

Thuis a brilliant codewar

u sure that this is a good option? ty

so pythonic

Print them.

Same problem here using Ruby. Be great to see the inputs!

Hello, I get the exact same result in Ruby. Would it be possible to see the inputs?

I believe this is the kata you were looking for? http://www.codewars.com/kata/525c7c5ab6aecef16e0001a5

Good job.

I found it, I had a space after ninety to save time on the concatination, but it doesn't play well.

How so?

I think your solution returns "eightteen".