In python Write a 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 $4.$

Code Structures Needed:

f$-$string

functions $($return$)$

for in $($repetative structure$)$

main $($function$)$