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: 2, 2, ['M', '3453', '5733', '2337', '9975', '1827', 't', '4937']

SOLUTION: 3453

PROBLEM: 11, 13, ['k', 'f', '9679', 'u', 'd', '6233', '5261', 'l', 'm', '9395', '8695', '6609', 'e', 'R', 'H', 'Q', 'z', 'P', 'l', 'W', '8067', '8123']

SOLUTION:
15304