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: 14, 26, ['U', 'D', '5391', '2975', 'b', 'b', '8741', '8991', '9083', '5401', '481', 'q', 'j', '8757', 'C', '2027', '6683', '5667', 'R', '631', 'm', '3743', '9769', '1039', '923', 'Q', '4373', '7451']

SOLUTION: 39239

PROBLEM: 5, 6, ['W', '4759', '7861', '321', '5573', 'O', 'N', '157']

SOLUTION: 5573

PROBLEM: 1, 4, ['Y', '2715', 'l', '4725', '7725']

SOLUTION:
7440