ok. I understood what you mean. Thank you.

Those are already reversed, print the input. Your code revesed only letter in letters resulting in rettels.

Yeah, you are right. It can't input.
To satisfied this challenge, I thought All words that is taken more than 5 letter need to spin. But why didn't spin the words?

:: rettel, dedulcni, sdrow , tsisnoc , desrever , noitcnuf , sdrow , gnirts

I doubt this words.

Those two sentences are not equal:

'that the the rettel be dedulcni rettels is sdrow is rettels tsisnoc desrever more noitcnuf will sdrow or sdrow that of more a gnirts or five only more'
                                 |     |             |     |
'that the the rettel be dedulcni srettel is sdrow is srettel tsisnoc desrever more noitcnuf will sdrow or sdrow that of more a gnirts or five only more'

The first one is what your function returned btw, not the input.

In python, when I run the code,it occur one error. It shows this message: 'that the the rettel be dedulcni rettels is sdrow is rettels tsisnoc desrever more noitcnuf will sdrow or sdrow that of more a gnirts or five only more' should equal 'that the the rettel be dedulcni srettel is sdrow is srettel tsisnoc desrever more noitcnuf will sdrow or sdrow that of more a gnirts or five only more'

As you can see equal sentence, it didn't change correctly to suit this challenge needs.

Awesome!

looks good.