write this code in python basic

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