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: 1, 11, ['q', 'q', 'P', '4335', 'l', 'k', 'D', 'R', '719', 'g', '855', 'l', '6639', '7935', '8407', 'A', 'H', '8357', '759', 'i', '1205', 'B', 'Q', 'V', '359', '4565', '9975', 'g', 'h', '9585']

SOLUTION: 5909

PROBLEM: 15, 22, ['6267', '5681', 'P', 'X', '4621', '7515', 'L', 'm', '4683', 'G', '5153', 'f', 'r', 'm', 'j', 'C', 'P', 'R', '521', 't', '2277', '9197', 'p', '6441']

SOLUTION:
11995