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: 3, 18, ['P', '1429', '3883', '1883', 'u', 'K', 'N', 'j', 'u', 'H', 'y', '7785', '7371', '6869', '1613', '6515', '695', 'U', 'u']

SOLUTION: 36614

PROBLEM: 9, 12, ['4189', '4575', 'i', 'e', 'Y', '5595', 'U', 'M', 'b', 'n', '5347', 'v', 'w', 'Z', 'F', '503', 'G', '4429', '3087', '295', 'W']

SOLUTION: 5347

PROBLEM: 13, 16, ['9365', 'q', 'r', '8577', 'P', '6959', '8465', 'X', 'd', 'u', 'O', 'N', '2953', 'r', 'x', 'B', 'm']

SOLUTION:
2953