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: 5, 7, ['t', 'e', 'P', 'H', 'I', 'U', 'a', '8147', 'i', 'D', 'x', 'x', 'i', 'm', '4893', '6443', '8841', 't', '4641', '9415', '1965', '673']

SOLUTION: 0

PROBLEM: 1, 8, ['O', 's', '3399', '1813', 'T', '4477', '7161', 'z', '1173', 'Y', '6051', '7509', 'i', '9765', '809', '6191', 'f', '1983', 'm', '1043', '8465', '9511', 'i', 'p', '4891', 'K', 'W', 'W', '239']

SOLUTION: 16850

PROBLEM: 5, 6, ['9151', '2061', '8067', '2557', '659', '7883', '7303']

SOLUTION:
8542