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: 1, 3, ['c', '2957', 'u', '2321', 'q', 'P', '2347', 'O', 'P', '4463', 'u']

SOLUTION: 2957

PROBLEM: 9, 21, ['h', 'C', '8411', 'j', '5693', 'L', 'D', 'V', 't', 't', 'E', '3101', '5045', '9945', 'P', 'q', 'e', 'k', 'T', 'b', 'A', '7015', '6635', '3769', 'j', 'X', '6469']

SOLUTION: 18091

PROBLEM: 4, 7, ['P', 'P', 'Q', 'x', '6823', 'N', '9661']

SOLUTION:
16484