flags are stepic

Hint: In the country that doesn't exist, the flag persists

Among all the countries shown, Upanzi Republic doesn't exist. Download its flag (upz.png) \ Challenge name is a clear hint to Stepic Steganography

import stepic
from PIL import Image

img = Image.open('upz.png')
hidden_data = stepic.decode(img)
print(hidden_data)