#YACST2
> Captcha is a modern simple Turing test for everyday use, for human> it's simple, but for bot or a simple neural network captcha can become> a hard nut to crack.> > You can try to solve it with your AI too, but it definitely can be> solved with several lines of code, isn’t it?> > [link](http://yacst2.2016.volgactf.ru:8090/)> > Hints> > [gist](https://gist.github.com/volalex/799789663f8c29f1bb58)> > [gist2](https://gist.github.com/volalex/4c62beaa721807dbc139) Adding a> Noise
**Algorithm**
1. Send request to the site, get remaining number of captchas.2. Download captcha using **curl** (don't ask me why!).3. Send it to the *Google Speech Recognizer* using python module **speech_recognition**4. Send numbers to the server.5. Repeat until you receive flag.
[solve.py](./solve.py)
It took 4 hours to solve 3k captchas. But last captcha I had to solve by myself (for sure :).
Flag is:
> VolgaCTF{Sound IS L1ke M@th if A+B=C THEN C-B=A}