Teacher: 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.
Teacher: Now, understand the problem? If you are still confused, see the following example:
3, 7, ['A', '23', '7413', '6933', '3369', '807', 'M', '456']
Solution: 18522
Reason: Here, the numbers from 3rd to 7th position are '7413', '6933', '3369', and '807', hence their sum (7413+6933+3369+807) is 18522.

Now, solve this instance: 3, 3, ['2703', '3211', '1671', 'C', 'P', '3539', '9811', '8799', '7621', '9699', 'k', 'e', '7729', '7015']
Student:
1671