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: 10, 16, ['V', 'b', '2575', '385', 'U', 'I', 'Y', '2647', 'V', 'k', '6379', 'W', '1883', 'n', 'K', '3001', '6791', 'I', '4285', 'f', 'i']

SOLUTION: 11263

PROBLEM: 16, 18, ['o', '3669', 'M', 'M', 'R', 'r', 'o', 'P', 'q', '9939', '1807', 'F', 'J', 'a', '7773', 'I', 'A', '475', 'W', 'E', '417']

SOLUTION: 475

PROBLEM: 6, 16, ['6309', 'F', 'j', 'b', 'r', 'o', 'l', '3501', '7633', 'A', 'r', 'w', 'D', '9739', '5175', 'r', 'd', 'Z', 'F', '7467', 'z', '7043', '2547', 'C', '8921', 'c', '5783', 'u']

SOLUTION:
26048