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: 7, 15, ['k', '7859', '7463', 'f', 'd', 'L', 'O', 'K', '4629', 'n', 'T', '3785', 'I', 'o', 'Q', '8331', 'U', 'W', '2311', 'u', '5821', '9193']

SOLUTION: 8414

PROBLEM: 1, 7, ['Y', 'n', '8993', 'X', '7211', 's', 't', 'R', 'm', 'L', '9559', 'K', 'j', '791']

SOLUTION: 16204

PROBLEM: 2, 2, ['3319', '7829', '3237']

SOLUTION:
7829