How to read text from the captcha?

How to recognize text from the captcha? I’ve used different types of OCR but can’t get a solution. Captcha is varies for every run. I’ve attached a photo below.

captcha
Captcha1
Captcha2

Captcha’s are used to stop this exact thing, they’re used to stop robots accessing them so it’s quite unlikely that there will be a stable solution

use a Input Dialog activity and ask user to enter captcha manually. After that use Type Into activity to fill captcha (To fill captcha manual intervention will be required).