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, 18, ['P', '1429', '3883', '1883', 'u', 'K', 'N', 'j', 'u', 'H', 'y', '7785', '7371', '6869', '1613', '6515', '695', 'U', 'u']

SOLUTION: 36614

PROBLEM: 25, 26, ['9367', 'G', 'c', '4997', 'g', 'r', '2893', 'T', '6693', 'I', '5127', 'N', '4333', '6905', '8539', 't', 'y', 'f', '8341', 'e', 'g', '8749', '3525', 'g', '6263', '321']

SOLUTION: 6584

PROBLEM: 1, 6, ['2501', 'I', 't', '5941', 'Q', 'x', '9299', '2229']

SOLUTION:
8442