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: 2, 7, ['C', 'C', '9639', '7815', 'N', '1713', '8339', '4237']

SOLUTION: 27506

PROBLEM: 5, 6, ['M', '4965', '7693', 'g', 'G', '695', '2401', '5715', 'P', '8197']

SOLUTION: 695

PROBLEM: 13, 16, ['2629', '751', 'p', '6045', '3899', '7193', 'E', '2279', 'h', 'B', 'm', 'S', 'M', 'n', '6421', 'U', 'B', '9285', '7107']

SOLUTION:
6421