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

SOLUTION: 6189

PROBLEM: 17, 22, ['D', '7897', '1603', 'L', '5485', 'S', 'V', '1361', 'a', '9131', 'm', 'V', 'l', 'v', 'Z', '4831', '9561', '1185', 'y', 'D', '1853', '2225', 'j', 'r']

SOLUTION: 14824

PROBLEM: 1, 1, ['1449', '1257']

SOLUTION:
1449