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: 4, 8, ['6669', 'G', 'y', '129', 'y', 'x', 'w', 'C', 'J']

SOLUTION: 129

PROBLEM: 2, 2, ['R', '979', 'H', 'W', 'y']

SOLUTION: 979

PROBLEM: 3, 6, ['l', 'C', '6183', 'd', '6519', 'm']

SOLUTION:
12702