import bs4

import requests

import urllib2

import time

import base64

session=requests.Session()

response=session.get('http://oj.blue-whale.me:23331/captcha.php')

soup=bs4.BeautifulSoup(response.text)

s=soup.find('img') #get the img tag

#print s

#we get s,but the type of s is class

#print s['src']

#use [] get the tag's attributes

#use .string get the text between<tag>and</tag>

#get tag's attributes

src=s['src']

#get text of the photo

photo=src.split(',',1)[1]

#decode the photo

photo=base64.b64decode(photo)

#show photo

#print photo

# we take <text></text>,sort by x

text=photo.split("<line",1)[0]

text=text.split(">",1)[1]

text=text.split("</text>")

#print text

#get char and x pos

ans={}

for chars in text:

    print chars

    length=len(chars)

    if length<3:

        break

    char=chars[length-1]

    ch=chars.split()

    x=ch[1].split('"')[1]

    x=int(x)

    ans[x]=char

    print length,char,ch[1],x,ans[x]

ans=sorted(ans.iteritems(), key=lambda d:d[0], reverse =False )

print ans

url='http://oj.blue-whale.me:23331/captcha.php?code='

s=''

#print type(ans)

#after sorted ,type(ans)=list??

for ch in ans:

    s=s+ch[1]

url=url+s

flag=session.get(url)

print flag.text