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, 6, ['u', 'L', 'm', '9283', 'e', '4615', '7815', '7185', 'h', 'h', '8985', '3987', '1521', 'k', '5715', 'd', 'w', 'T']

SOLUTION: 13898

PROBLEM: 1, 2, ['8895', 't', '5739']

SOLUTION: 8895

PROBLEM: 3, 5, ['1371', '2029', 'B', '1287', 'X', 'E', '731', 'v', 'C', '2659', 'l', '5523', 'I']

SOLUTION:
1287