#!/usr/bin/env python
# -*- coding: utf-8 -*-
__author__ = 'huhu, <huyoo353@126.com>'
def find_middle(start, end):
  #print start, end
  return round((start+end)/2.0)
if __name__ == '__main__':
  start, end = '',''
  text = raw_input(u"> 输入猜数的范围（如：421-499 或者421 499 或者421,499）:").decode('gb18030')
  spliters = '-, '
  for c in spliters:
    if text.find(c) != -1:
      num_list = text.split(c)
      if ''.join(num_list).isdigit():
        start, end = num_list[0],num_list[1]
        break
  if start == '' or end == '':
    print u'范围不正确'
  else:
    start = int(start)
    end  = int(end)
    count = 1
    last_guess = find_middle(start,end)
    while 1:
      result = raw_input(u"放弃猜测直接回车, 等于输入=, 小了输入1, 大了请输入2\n>>> #猜数[%d] ,对吗？> " % last_guess ).decode('gb18030')
      #print type(text)
      if result in ['q','e','exit','quit','bye',u'退出']:
        print 'Bye!'
        break
      else:
        result=result.strip()
        if result == '1':
          start = last_guess
          last_guess = find_middle(last_guess,end)
        elif result == '2':
          end = last_guess
          last_guess = find_middle(start,last_guess)
        elif result == '=':
          print u'恭喜猜中, 共猜了%d次' % count
          print u'#猜数[%d]' % last_guess
          break
        else: #
          continue
        count += 1