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: 8, 25, ['y', 'r', '639', '6501', '7755', 'A', 'v', 't', '3209', '7899', 'Z', '6099', 'Q', 'L', 'T', 'b', 'P', '6913', 'J', '8855', '551', '4509', '143', '9331', 'c']

SOLUTION: 47509

PROBLEM: 6, 7, ['6997', '3987', '2463', 'm', 'W', 'R', 'a', 'U', 's', 'Y', 'X', '4193', '343', 'Y', '4277', 'n', 'W']

SOLUTION: 0

PROBLEM: 1, 2, ['Q', 'y']

SOLUTION:
0