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: 12, 15, ['I', 'H', '3483', '6289', 'X', '5705', '7707', 'x', 'J', 'c', '5161', '9653', '3949', 'l', 'b', 'C', 's', '17', 'a', '4231', 't']

SOLUTION: 13602

PROBLEM: 7, 17, ['n', '1023', '2743', 'r', '5855', 'd', '4425', '3381', 'x', '9609', 'f', 'o', '8513', 'e', '7331', 'N', '7949', 'O']

SOLUTION: 41208

PROBLEM: 16, 27, ['H', 'u', '587', '9381', 'F', '2123', '2863', 'E', 'Y', 'm', '1033', 's', 'n', '8419', 'U', 'C', '9347', '7897', '5405', '8865', 'V', 'K', 'W', 'R', '8129', '4777', '1053', 'M']

SOLUTION:
45473