# -*- coding: utf-8 -*-
"""
Created on Fri Dec 31 18:10:35 2021

@author: 玦祎
"""

f = open('作业二素材.txt',encoding='utf-8')
txt = f.read()
f.close()
index = txt.find('\n顺丰控股股份有限公司')
txt_target = txt[:index]
e = txt_target.rfind('。')
s = txt_target[:e].rfind('。')
last_jz = txt_target[s+1:e+1]
last_jz = last_jz.replace('\n','')
print(len(last_jz))