See here : [https://berryberry.hatenablog.jp/](https://berryberry.hatenablog.jp/entry/2022/03/07/230635)
First of all, I got a file "Message.wav".
## Solution
Open with audacity. Then, display spectrogram and set the sampling frequency to 22050 Hz. Now, we can see this image.
I thought the message was "we need infoce me", however this was incrrect. This was unnatural, but also read as natural. I took some mistakes for submitting flag. Finally, I understand what message below is.
```
CTF{WE-NEED-INFORCEMENTS}
```