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: 11, 12, ['2735', '2057', '8217', '7745', 'p', '165', 'e', 'g', 'c', '2391', '523', 'R', '1009']

SOLUTION: 523

PROBLEM: 7, 18, ['279', 'o', '8421', 'e', '2167', '6647', 'i', 's', 'I', 'G', '8201', 'E', 'h', 'U', '403', 'c', 'u', 'B', '9415', 't', 'a', '8787', 'E', '9677']

SOLUTION: 8604

PROBLEM: 13, 17, ['U', '7187', 'X', 'f', '3297', 'U', 'f', '9589', 'f', 'X', 'i', 't', '9101', '1319', '3371', 'H', '3641', '8389']

SOLUTION:
17432