Hi, there are lots of tests with a similar input so it's hard to tell which one you are failing on: try printing the input so you can see what the string being passed to your function actually looks like:

https://docs.codewars.com/training/troubleshooting/#error-messages-and-printing-your-inputoutput

Then you can "debug" manually, by comparing your code to the conditions given in the description. For example maybe your code is failing due to whitespace, capital letters, empty string etc.