thanks guys, I figured it out!

It could be that you are not making sure you are giving the lexicographical solution. This means if the word being tested is billboardsa then the output should be 'a' even though 'b' appears first in the word.

this was defiantly a challange for me but I surely learned something from it. In my opinion it was harder than average 7kyu katas.

what exactly do I need to output? Can you clarify?

Yes, using console.log() at start of the function.

Do I have the opportunity to see random tests?

Look at how many solutions have passed in JS. Perhaps you could post the test that is not working and the result you are getting.

JS, Node JS

Ok. Thank you

If Python, then you need to check your code. There are many correct solutions.

Python

Which language?

Which language?

I don't think you understood the task correctly. Also, your log isn't helpful, unless you put the input that it corresponds to. (argument string)

Maybe you can find some hints in this FAQ.