TASK 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.
PROBLEM: 9, 21, ['h', 'C', '8411', 'j', '5693', 'L', 'D', 'V', 't', 't', 'E', '3101', '5045', '9945', 'P', 'q', 'e', 'k', 'T', 'b', 'A', '7015', '6635', '3769', 'j', 'X', '6469']

SOLUTION: 18091

PROBLEM: 2, 16, ['v', 'd', '6599', 'd', '9305', '6377', '5009', '3797', '3861', '9421', 'G', 'N', 'm', 'x', 'E', '7047', 'W', '5629', 'j']

SOLUTION: 51416

PROBLEM: 10, 17, ['J', 'T', 'c', '3457', 'K', '9371', '1361', 'w', 'H', 'I', '2229', '7773', '8239', 'r', '1181', '7693', 'Q', 'T', '729', 'x']

SOLUTION:
27115