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: 21, 27, ['2789', '3875', '2351', 'Y', '1127', 'J', 'Z', '5187', 'c', '8115', '3459', 'Y', 'f', 'o', 'L', 'H', '2931', '879', 'L', 'e', '3745', '173', 'v', 'W', '9393', 'Y', '7651']

SOLUTION: 20962

PROBLEM: 4, 6, ['v', 'f', '5021', 'v', 'M', '6345', '1159', 'C', '8173', '6299', 'r', '8877', 'a', 'm', 'k', '2935']

SOLUTION: 6345

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

SOLUTION:
7721