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: 1, 3, ['c', '2957', 'u', '2321', 'q', 'P', '2347', 'O', 'P', '4463', 'u']

SOLUTION: 2957

PROBLEM: 2, 19, ['u', 'x', '1103', 'K', 'N', 'o', '1943', 'Z', 'r', 'B', 'N', 'e', '7289', 'S', '325', 'G', 'x', 'D', '9005', 'y', '1729', '961', '4621', 'D', 'u', '1235']

SOLUTION: 19665

PROBLEM: 2, 8, ['6225', 'z', 'Y', 'L', '9723', '9443', 'K', 'G', '3263', '5731']

SOLUTION:
19166