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: 6, 18, ['6619', 'W', '8541', '1049', '3973', '6575', 'C', '4961', '2469', '3553', '6905', 'p', 'c', 'K', '2663', 'm', 'B', '4379', 'D', '6557', 'r', 'N', '4875', 'u', 'X', '3133', '6353', '1635']

SOLUTION: 31505

PROBLEM: 6, 15, ['H', 'u', 'Y', 'Z', 'm', '1897', 'u', '2511', '507', '4977', '2019', '8913', 'Q', '5835', '1787', 'q', '1197']

SOLUTION: 28446

PROBLEM: 15, 17, ['F', '7937', '2911', '3373', 'A', '8541', 'q', 'J', 'L', 'G', 'Y', '5755', '7447', '741', 'F', '9869', '3799', '9281', '9647', '4185', 'S', '413', '3819', 's', '7777']

SOLUTION:
13668