Same thing, just tried and it works perfectly. "SUBMIT" comes only if you have succeeded with "ATTEMPT".

Same problem trying php version.

I just tried and it works. Maybe a temporary problem at CW?

I attended this question in javascript. Able to run sample tests but no option to submit. Weird!!

Good work!

Thanks. Solved the Kate now. It's my mistake didn't check for empty array.

Might be some error in your code...

While training on python version of the solution:
got following error:

Basic tests
✔  Test Passed
✔  Test Passed
✔  Test Passed
✘  False should equal True

Print the input to your console.

I am getting one error for basic test failed. But not giving the exact case.
✘ Expected: false, instead got: true