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, 14, ['99', 'F', '1297', '7085', 'u', 'w', 'w', '3803', 'F', 'D', 'F', 'L', '5967', '3545', 'E']

SOLUTION: 20400

PROBLEM: 6, 6, ['I', '8721', '6901', '737', '5767', '9771', 'h']

SOLUTION: 9771

PROBLEM: 3, 6, ['81', 'O', 'c', 'y', 'b', '4087', '4261', 'l', '2149', '1043', '9895', 'O', 'i', 'q', '2583', 'r', 'X', '4391', '1687', 'f', '4059', 'v', 'W', '3275']

SOLUTION:
4087