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.
Input: 7, 8, ['m', 'C', 'X', 'S', '5609', 'R', '8407', 'R', 'x', 'l', '9039', '9369', '1683', 'V', '6685', 'r', '1531', '7771', 'h', '999', '3435', 't']

8407