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, 12, ['K', '5995', '5183', '67', '563', '9143', 'M', 'H', '2923', '1825', 'y', '373', 'm', 'w', 'x']

SOLUTION: 5121

PROBLEM: 8, 12, ['i', '35', 'v', 'G', 'o', '5861', '8371', 'P', '1895', '6183', '8025', '2455', '4763', '409', 'e', 'A', '9029', 'a', 'I', '2761', '5481', 'f', '3413', '803', 'W', 'A', '8781']

SOLUTION: 18558

PROBLEM: 6, 10, ['S', 'e', 'Q', '3923', '5657', '4263', '4663', 'G', '229', '3231', 'j', 'C', '7629', 'N', 'i', 'C', 'p', '6039', 'K']

SOLUTION:
12386