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, 4, ['X', 'o', '8807', 'r', 'q', '825']

SOLUTION: 8807

PROBLEM: 10, 14, ['u', 'o', 'V', '8223', '365', 'u', '8971', '4209', 'E', 'I', '3385', '5521', '1329', 'b', 'C', '5707', '1807', '2859', '7443', '8141', 'u', '6269', '5781', 'T', 'N', 'R', 'C']

SOLUTION: 10235

PROBLEM: 6, 16, ['t', 'D', 'I', 'o', '811', 'A', '3471', 'M', '23', 'e', 'C', '2919', '7541', 'S', 'O', 's', '1503', 'W', '1959', 'e', '1891', '6493']

SOLUTION:
13954