Captcha

I read these topics TopikRas TopikDvas and could not agree with the proposed options (although I really liked the version built on trust in the user). Sometimes, after all, such a captcha is forgotten that even a person with good eyesight can not see all these symbols, and if the person is also color blind and his color of the number with the background merges? what to do? ... and if someone has problems with volume figures? in general, they somehow solved the problem of humans inhumanly! ) ... And here’s what I’ve come up with today: Please write the word * mom * using 2 commas in any places and 1 space before the last letter.
And of course a line for input with which you can also play for example: ask the user to put a certain character or, on the contrary, not to put this character in a certain place and mark it in the input field (with an arrow, point, color ... with which, in principle, you can play let's enter only over the black dots or just over whites, or not enter there)
What does this give?
1) Solves a problem with color blindness
2) Uses a completely logical question for a person and extremely difficult for a machine.
That's all for now ... so far it seems to me that this is quite a real solution to the problem!
What are the cons I see?
1) It’s so namudit with the question that even a person with higher education will not understand it)). It just gets confused and everything ... or go too far with requests ... to make them too much or make them too difficult to understand.
2) Questions will have to write in different languages. (relevant for sites that are visited not only by Russian-speaking guests).