Hint for Clue 17 of "The Hunt"

Warning: All the posts titled "Hint for Clue X of "The Hunt" contain spoilers. If you really want to attempt "The Hunt" without any clues, please don't read these posts.

The bottom half acts as an index to the flags. i.e each flags stands for a number. The ! in the top half are delimiters, not the factorial sign. Add the numbers between !s, then convert them into alphabets.