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: 2, 2, ['8023', '9385', '7533', 'd', 'H', '3751', 'A', '1399']

SOLUTION: 9385

PROBLEM: 2, 12, ['a', '5207', 'K', '1237', 'n', 'w', '2759', '943', '971', 'H', 'z', '6357', '463', '3991', 'M', '623', '8875', '1723']

SOLUTION:
17474