import mechanize
import time

def foo():
    url = 'http://sibears.ru/training/qctf_quiz/'

    br = mechanize.Browser()
    response_str = br.open(url).read()

    dict = {}
    level = 1
    question = ''
    possible_answers = []

    # while level < 2785:
    while level < 100:
        try:
            new_question = response_str.split('<div class="header">', 1)[1].split('</div>')[0]
            new_level = int(new_question.split('/')[0])

            if new_level == 1:
                question = new_question
                level = 1

            if new_level > level:
                dict[question] = answer
                possible_answers = list()
                question = new_question
                level = new_level
                #print question

            try:
                answer = dict[question]
            except Exception:
                answer = next(possible_answers)

            br.follow_link(text=answer)
            response_str = br.response().read()
        except Exception:
            possible_answers = iter([link.text for link in br.links()])
            continue

if __name__ == '__main__':
    start_time = time.time()
    foo()
    print time.time() - start_time