Write a program that asks the user to enter a series of single-digit numbers with nothing separating them (Input String is 4 characters long). The program should display the sum of all the single-digit numbers in the string. If the user enters 2514, the method should return 12 , which is the sum of 2,5,1, and 4 . Examples: Please enter the String: 2514 The Sum of 2,5,1,4 is: 12 Please enter the String: 1 The Sum of 1 is: 1 Please enter the String: 01 The Sum of 0,1 is: 1 Please enter the String: 0123 The Sum of 0,1,2,3 is: 6 Please add comments to your code, so the graders understand your programming logic. Separate your code sections into (IPO) Input Processing and Output