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: 18, 27, ['1757', 'B', '5165', 'v', 'c', '2699', '9861', '3935', 'p', 'A', '6855', '5233', '1543', 'A', 'H', 'o', 'P', '6749', '2411', 'B', 'U', 'G', '1645', '1543', 'x', '7271', '4383', 'n', '2725', 'n']

SOLUTION: 24002

PROBLEM: 4, 8, ['V', 'd', 'c', '9255', 'A', '2017', '4525', '4237']

SOLUTION: 20034

PROBLEM: 5, 6, ['5421', 'O', 'r', 'K', '741', '4039', 'n', '4763', 'q']

SOLUTION:
4780