import getpass                                  #用于隐藏用户输入的字符串，常用来接收密码

def checkuser(user,passwd):

    if user == 'chenhang' and passwd == '':

        return True

    else:

        return False

if __name__ == "__main__":

    userr = input('Input the user:')

    passwdd = getpass.getpass('Input the passwd:')

    if checkuser(userr,passwdd):

        print('OK!')

    else:

        print('ERROR!')