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: 14, 14, ['a', 'i', '5431', 'U', '9109', 'm', 'H', '7643', '127', 'a', 'S', '4285', '5625', '5479', '6409', 'U', 'n', 'R']

SOLUTION: 5479

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

SOLUTION: 10418

PROBLEM: 7, 11, ['n', '851', '1155', '5763', 'k', 'f', '3761', '1167', 'E', 'h', '1261']

SOLUTION:
6189