Write a script $($Ch$8/$P$2.$py$)$ that asks the user to enter a series of single$-$digit numbers with nothing separating them. The script should display the sum of all the single digit numbers in the string. For example, if the user enters $2514,$ the script should return $12,$ which is the sum of $2,5,1,$ and $4.$ Create one new function and call it in the script.

create the script Ch$8/$P$2.$py