Part 1. Definition
In this task, you are given inputs i,j, and A, where i and j are integers and A is a list. You need to return the sum of all the numerical elements in the list A between the positions i and j (including positions i and j). Return 0 if no numerical element is present in the list between the given ranges. i and j will be non-negative, and will always have a value less than the length of A. i will always be less than j.
Part 2. Example
3, 7, ['A', '23', '7413', '6933', '3369', '807', 'M', '456']
Answer: 18522
Explanation: Here, the numbers from 3rd to 7th position are '7413', '6933', '3369', and '807', hence their sum (7413+6933+3369+807) is 18522.
Part 3. Exercise
2, 2, ['a', 'P', '7397', 'y', '9731', '7159', '3409', 'm', '3791', 'P', '1921', '4977', '9829', '1035', 'f', 'H', '7843']
Answer:
0