This challenge was quite boring and generic. It seems, that not the tiniest bit of love went into making this task.
1. Run ```binwalk -e challenge.jpg``` to extract any hidden files (of well-known formats)
2. Find 196 pictures, most of which are flags of countries, in the output folder
3. Browse trough the pictures and find ```jp.png```, which has written some generic hex string on it.
4. This string is the flag: ```6C76648BEDF6B6C5A9D48564FC68868D```
Summing up, the biggest challenge was recognising the flag as THE flag, because the absence of a specified flag format.
YOU CAN USE STEGSOLVE TO VIEW THE FLAG.