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, 25, ['H', '501', 'F', '4923', 'C', 'T', 'R', 'b', 'Z', 'e', 'i', 'H', '755', '6503', '2825', 'H', '1995', '7283', '2735', '4433', 's', 'P', '795', 'Z', 'Z']

SOLUTION: 32247

PROBLEM: 6, 16, ['4469', '9515', 'z', '153', '123', '787', '3795', '1737', '6047', 'l', '165', 'C', 'p', '5221', 'M', '4149', 'L']

SOLUTION: 21901

PROBLEM: 7, 9, ['6847', '7497', '2489', 'V', '6541', 'E', 'f', 'p', '7139', '3683', '3031', '8467']

SOLUTION:
7139