I think because is on even position of the index.

Yes

too bad, I was too quick... XD

np. ;)

Returned here to delete comment after realizing that

Thanks

not an issue. Just print the input to the console and read carefully the error message.

If that may help: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution

not an issue: you misunderstood something because there is absolutely nothing special about the exclamation mark (or any other character)

Please, add some description about "!" and why it's not moving.