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: 1, 2, ['7321', '6233']

SOLUTION: 13554

PROBLEM: 16, 16, ['p', 'J', '4955', 'Y', 'g', 'V', 'K', '389', 'b', 'v', '6457', '1539', '1501', 'Z', '2363', '5385', '6031', 'n', '7227', '5031', 'j', 'M', 'y', '6095', '1921', 'M']

SOLUTION:
5385