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: 6, 15, ['U', 'E', '6873', '7621', '9241', '147', '4503', 'z', '3805', 'n', '4331', '4031', '2585', '9029', 'a', '7537', '975']

SOLUTION: 28431

PROBLEM: 4, 5, ['1427', '7597', '765', 't', '7057', 'f', 'B', 'k']

SOLUTION: 7057

PROBLEM: 6, 9, ['e', 'U', 'g', '7275', '3983', '9131', 'g', '8059', '3075']

SOLUTION:
20265