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, 13, ['6413', 'n', 'z', 'T', 'R', 'Y', 'D', 'W', 'L', '521', '3411', 'B', 'O', '6757']

SOLUTION: 3932

PROBLEM: 3, 15, ['i', '3795', '7239', '6365', 'i', '4003', 'v', '6905', '9227', 'u', 'e', '5621', 'M', '7481', '4721', 'I', 'e', 'o', 'K', 'f']

SOLUTION: 51562

PROBLEM: 2, 3, ['A', '119', '2409']

SOLUTION:
2528