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: 21, 24, ['6903', '3349', '4585', 'C', 'w', 'I', 'U', 'n', '2689', 'W', '6601', '7357', '5063', 'y', '5779', 'L', '4257', 'd', '653', 'k', '8349', 'r', 'Y', '3019', 'E', '797', 'm']

SOLUTION: 11368

PROBLEM: 6, 6, ['I', '8721', '6901', '737', '5767', '9771', 'h']

SOLUTION: 9771

PROBLEM: 2, 16, ['5707', 'i', '399', 'o', 'c', 'b', 'a', 'E', 'b', 'e', 'W', '8715', '31', '7771', 'a', '4805', '1475', '2795', '5693']

SOLUTION:
21721