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: 19, 21, ['y', '9403', 'C', '389', '5521', '9271', 'W', 'B', '3613', 'w', '2741', 'H', '8305', '727', '7641', '5857', '9183', '1297', 'p', '7371', 'b']

SOLUTION: 7371

PROBLEM: 8, 12, ['v', 'N', '8123', '1677', '5743', '8657', 'S', '5073', 'Y', 'R', '2781', '6583', 'A', '1989', 'S', '9301', 'y', 'j', '1759', 'U', '9951', 'W', '5967', 'a', 'c']

SOLUTION: 14437

PROBLEM: 16, 18, ['8507', 'D', 'w', 'f', '5437', '1495', 'o', 'P', '669', '7661', '2163', '8659', 'a', 'B', '561', 'T', '5985', 'd', '4157', 't', '4945', 'r', 'z', '3861', '6349', 'f']

SOLUTION:
5985