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: 8, 25, ['y', 'r', '639', '6501', '7755', 'A', 'v', 't', '3209', '7899', 'Z', '6099', 'Q', 'L', 'T', 'b', 'P', '6913', 'J', '8855', '551', '4509', '143', '9331', 'c']

SOLUTION: 47509

PROBLEM: 13, 14, ['6693', 'J', '2765', 'P', 'h', '755', 'z', '7483', 'W', '6895', '1293', '3479', 'Y', '1667', '9635']

SOLUTION: 1667

PROBLEM: 9, 13, ['2813', 's', 'z', 'G', '5927', '4415', 'T', 'c', '7029', 'e', 'o', 'd', '5913', 'y']

SOLUTION:
12942