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, 21, ['7753', '4315', '7527', 'R', 'W', 'a', '3983', 'w', 'F', '8967', 's', 'Y', 'D', 'I', '5305', '2535', 'u', '135', 'M', 'D', 'G', 't', 'r', 'g', 'W', 'V', '3461', 'P', 'T', 'd']

SOLUTION: 32767

PROBLEM: 6, 18, ['5051', 'g', 'C', 'p', 'O', 'i', 'E', '4947', '5345', '8453', '4967', '3749', 'F', 'P', '5045', 'o', '5605', 'H', '9319', '5471', 'F', 'B', 't', 'H']

SOLUTION: 38111

PROBLEM: 7, 8, ['S', '9621', '2849', 'D', 'n', 'M', 'b', '869', 'u', '6261', 'u', 'b', 'b']

SOLUTION:
869