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, ['g', 'g', 'K']

SOLUTION: 0

PROBLEM: 15, 21, ['w', 'R', '9247', '5745', '5397', 'U', 'R', 'e', '8067', 'e', '2851', 'O', 'F', '4705', '5393', 'q', 'b', 'J', '211', '4319', 'o', 'h', 'Z', '4423', 'j', '2691', 'U']

SOLUTION: 9923

PROBLEM: 4, 5, ['8311', '3783', '5833', '231', '8105', 'T', '5285']

SOLUTION:
8336