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: 3, 4, ['3949', '5315', 'G', 's', 'v', 'm', '7833', 'E', 'j']

SOLUTION: 0

PROBLEM: 1, 7, ['Y', 'n', '8993', 'X', '7211', 's', 't', 'R', 'm', 'L', '9559', 'K', 'j', '791']

SOLUTION: 16204

PROBLEM: 2, 2, ['L', '8647', 't', '2523', 'Z', 't', 'U', '5739', '4801', 'K', 'P', '1619', 's', '1785']

SOLUTION:
8647