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, 18, ['o', '3007', '4747', '869', 'H', '7455', 'U', 'G', '6009', 'H', 'p', '381', '5217', 'q', '1251', 'G', 'i', 'X', '7649', '415', '8053', 'o']

SOLUTION: 12858

PROBLEM: 1, 3, ['x', '971', '3029']

SOLUTION: 4000

PROBLEM: 4, 7, ['5583', 'd', '4627', '4273', 'H', 'J', 'Z', 'A']

SOLUTION:
4273