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: 6, 15, ['H', 'u', 'Y', 'Z', 'm', '1897', 'u', '2511', '507', '4977', '2019', '8913', 'Q', '5835', '1787', 'q', '1197']

SOLUTION: 28446

PROBLEM: 6, 7, ['6947', 'l', 'd', '6531', 'X', 'l', '9741', '6553', '9905', 'n', 'Q', 'Y', '2063']

SOLUTION: 9741

PROBLEM: 4, 8, ['K', '8021', 'K', 'Y', 'r', '4597', '1913', 'K', 'Y', 'r', 'n', 'z', '9761', '8939', '3087', '6085', 'f']

SOLUTION:
6510