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: 4, 5, ['b', 'u', '5279', '6945', '6631']

SOLUTION: 13576

PROBLEM: 4, 6, ['v', 'f', '5021', 'v', 'M', '6345', '1159', 'C', '8173', '6299', 'r', '8877', 'a', 'm', 'k', '2935']

SOLUTION: 6345

PROBLEM: 3, 6, ['6515', 'H', 'f', '5881', '881', 'i', 'x', '4403', '2991', '149', '5887', 'f', 't', 'c', '5365', '2005', 'R']

SOLUTION:
6762