Write a python program that asks the user to enter a series of single-digit numbers with nothing separating them.
the program should display the sum of all the single-digit numbers in the string.

for example, if the user enters 2514, the method should return 12, which is the sum of 2, 5, 1 and 4.

The length of time that a slide appears before automatically advancing to the next slide can be set in the timing group under the transitions tab. transition to this slide group under the transitions tab. timing group in the master slide view. transition to this slide group in the master slide view.