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: 2, 4, ['H', 'l', '7721', 'D', '2011', '211', '1115', '8051', '3231', '2999', '527', '447', '8043', '1967', 'g', '8463', '6279', '9211', '1231', 'z']

7721