Write a program that uses a bag of strings to keep track of a list of chores you have to accomplish today. The user of the program can request several services: 

(1) Add an item to the list of chores; 

(2) Ask how many chores are in the list; 

(3) Print the list of chores to the screen; 

(4) Delete an item from the list; 

(5) Exit the program.

If you know how to read and write strings from a file, then have the program obtain its initial list of chores from a file. When the program ends, it should write all unfinished chores back to this file.