print("enter the names of guest")
guest= []#empty list
name = " " #empty string
while name != "done" or "DONE" #while loop to continue asking the user for names that are not equal to done or DONE.
name= (input ('enter the names of guest (enter done or DONE if there are no more names): ')#taking the the names from the user.
if name.lower() != 'done' or name.upper() != 'DONE'# escape adding the done or DONE to the list.
guest.append(name)# adding the list from the user to the empty list..
guest.sort（）＃以有序的方式放置列表 打印（客体）