Oh, right, my bad.
Thank you so so so much. It works now! 
You can type len<TAB> to use auto-completion so that you can avoid this problem.
[I have noticed that Spanish speakers very frequently write `lenght` instead of `length`. I haven’t worked out why that might be, nor how to help them unlearn that.]
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Thanks for tip, I’ll use it!
[I’m not Spanish speaker, but it was a typo and I didn’t see difference between my original code. And, it could because f.e different words has similar end - " thought, lightweight", For someone who is just intemediate it’s not a big difference, unfortunately :(]
Spanish speaker here, I don’t know, but maybe it has something to do with the fact that in Spanish we have don’t use the - th sound