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.
Input: 4, 7, ['G', '783', 'C', 'L', 'v', 'g', '6791', 'Y', '7203', '4619', 'Y', 'Z', '4105', '921', '5253', '3455', 'A', '8125', '8519', '6943', '1515']

6791