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: 6, 13, ['x', '8293', 'W', 'O', '511', 'y', '9801', '7925', '3353', 'J', 'D', 'J', 'B', '2559', 'j']

SOLUTION: 21079

PROBLEM: 16, 17, ['5985', '1925', 'r', 'H', 'p', 'L', '5019', 'y', 'O', '6575', '9729', 'S', '2497', '43', 'u', '317', 'p', '3043', '3247', 'z', 'O', '8379', '7715', '8399']

SOLUTION: 317

PROBLEM: 18, 28, ['Z', 'R', 'f', '3021', 'I', 'U', '3043', '8829', 'Y', '8313', 'T', '537', '4005', '7437', 'x', 'i', 'A', 'f', 'e', 'U', 'P', 'j', 'h', '6307', 'c', '5383', '4937', 'z', 'K', 'C']

SOLUTION:
16627