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: 1, 20, ['N', '3757', '4835', '557', 'n', '3381', '3229', '9715', 'O', 'J', '5215', 'Q', '7867', 'W', '5159', '1571', '2911', '8907', 'J', 'b']

SOLUTION: 57104

PROBLEM: 4, 8, ['3753', 'y', '417', 'B', 'g', 'D', 'L', '6175']

SOLUTION: 6175

PROBLEM: 16, 17, ['8441', 'Y', '9443', 'y', '443', 'u', 't', '2803', '2787', '4429', '9617', '7931', '1527', '3045', '8875', 'F', '7869', '8863', '8455', 'U', '7209', '1079', '1471', 'S', 'B']

SOLUTION:
7869