exactly. I wrote my own parser in c# and it can work out unlimited lenght of strings. But writing that one row of code, and have kuy 4? No way.
But as i did, wrote my own stuff, i think i earned the kuy 4. :) I did, coz im so dumb at c#. Dont know there was such a easy way to solve it in c#. I programmed c++ for a while though. So of course, i dont know the easy ways in c#. :)

Another that allows duplicates.

One more vote for: it should be clear if 'Y' is considered a vowel in this kata.