#!/user/bin/python
# -*- coding:utf-8 -*-
count = 0
while count < 3:
    user = input("请输入用户名：")
    pwd = input("请输入密码：")
    if user == "zd" and pwd == str(123):
        print("登录成功")
        break
    else:
        print("用户名或密码错误")
    count = count + 1