Use the input function to consume a plus-separated string of numbers from the user (e.g., 4+2+3 ). Add up all these numbers and print their sum (9, in the case shown before) Note: Your code will be tested against multiple possible inputs. It is not enough to get the right output for your own cases, you will need to be able to handle any non-empty string of plus-separated string of numbers. You can assume that the user will only input plus-separated strings of numbers. Note: The user will only be typing in whole numbers, no decimals