url

import requests
i = 0
r = requests.get("https://stepic.org/media/attachments/course67/3.6.3/699991.txt")
a = r.text
url = "https://stepic.org/media/attachments/course67/3.6.3/" + a
while requests.get(url).text [0:2] != "We":
    i +=1
    print(i)
    r = requests.get(url)
    a = r.text
    url = "https://stepic.org/media/attachments/course67/3.6.3/" + a
print(requests.get(url).text)