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First I cut the image into pieces each of which contained a single glyph and googled by image.
After 10 minutes of searching I found that those symbols are from Proto-Sinaitic alphabet (https://en.wikipedia.org/wiki/Proto-Sinaitic_script). So it's easy to recover latin letters from them symbol by symbol. I also found a great picture:

![protosinaitic.png](https://raw.githubusercontent.com/eg-ctf/Chaos-Communication-Camp-2019/master/files/protosinaitic.png)

Recovered text: ```alphabetevolution```

And the flag is: ```ALLES{alphabetevolution}```