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: 3, 10, ['r', 'A', 'l', '7169', '3249', 'T', 'O', 'g', 'F', 'M', 'R', '171', 'M', '2449', '3749', 'f']

SOLUTION: 10418

PROBLEM: 10, 11, ['L', 'Z', '4501', '4131', 'a', '8057', 'K', 'P', '4713', '8889', 'b', '3927', 'k', '6005', 'T', 'w', 'S', '3963', '2727']

SOLUTION: 8889

PROBLEM: 9, 9, ['5031', 'T', '7131', '1869', '3463', '3067', 'Q', '465', '289']

SOLUTION:
289