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: 4, 12, ['f', '3507', 'T', 's', '9209', 'T', 'o', '769', 'U', 'i', 'V', '5723', '2151', 't', 'Z', '5857', '951', '3261', 'd', '407', 'X', '1869', '1483', '3631', '2949']

SOLUTION: 15701

PROBLEM: 2, 6, ['S', 'y', '2729', '9935', 'T', 'H', '3063', '9587']

SOLUTION: 12664

PROBLEM: 11, 15, ['4813', '4547', '9917', 'S', 'V', 'J', '7631', '7475', 'k', 'O', 'f', 'r', 'S', 'h', '4055', 'H', '3333', 'q', 'n', 'h']

SOLUTION:
4055