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: 5, 9, ['r', 'P', 'r', 'g', '5077', 'T', '2819', 'f', 'p', '6449', '8509', '8915', 'I', 'Z', 'N', '8657', 'R', '3739']

SOLUTION: 7896

PROBLEM: 14, 15, ['N', 'u', '4633', '5481', '2469', 'y', '2253', '4629', '8399', 'q', 'H', '8507', '1789', 'A', '5085', 'G', '9679', 'G', 'u', '9381']

SOLUTION: 5085

PROBLEM: 15, 17, ['D', 'x', 'f', 'f', 'E', 't', '6253', '6231', 'r', 'G', '5689', 'v', '6993', 'a', 'W', '2599', '4865', 'p', '9629', 'G', 'l', '5287', '4099', '6007', 'z', 'I', 'B', 'l', 'D']

SOLUTION:
7464