The second task consists of analysing a group of suspicious audio files Exsoundwav,

Exsoundwav and Exsoundwav determining which one contains a fournumber secret code.

In this case, the spy has used a more sophisticated method. It seems he has used amplitude

modulation to move the secret code to an ultrasonic range of frequencies, then mixing this code

with that of the suspicious audio files.

To solve this task, you must create an application in Python exercise that should detect which

one of the audio files seems to contain suspicious data in an ultrasonic range of frequencies, and

should be able to play the secret code in an audible range of frequencies.