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: 11, 19, ['Y', 'r', 't', '2931', '9519', '1071', '2417', 'p', 'F', '7509', 'l', '3451', '1907', 'z', 'E', 'n', '1251', 'k', 'p']

SOLUTION: 6609

PROBLEM: 10, 16, ['Q', '931', 'P', '6777', 'X', '3855', 'i', '1055', 'd', 'p', '7947', 'z', 'X', 'h', 'g', 'w', 'r', 'T']

SOLUTION: 7947

PROBLEM: 1, 3, ['Z', 'j', 'a']

SOLUTION:
0