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: 19, 19, ['4147', '1103', '5749', 'c', '5103', '3491', '4511', '197', 'T', '1601', 'J', 'c', '1309', 'a', '607', 'p', 'C', '9473', '5221', 'D', 'U', 'O', '5013']

SOLUTION: 5221

PROBLEM: 2, 6, ['S', 'y', '2729', '9935', 'T', 'H', '3063', '9587']

SOLUTION: 12664

PROBLEM: 12, 15, ['7867', '7113', 'I', 'G', 'j', '7237', '5681', '509', '9215', '5873', '6413', 't', '4503', 'i', 'z', '6557', 'C', 'w', '6833']

SOLUTION:
4503