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, 12, ['m', 'f', 'y', '2363', '9555', 'E', 'm', 'J', '1977', 'z', '3733', '9745', 'm', 'u', '1033', 'x', '7351', 'O', 'W', '8311', '955', '8643', 'D', 'e', 'z', 'M', '5139', 'o', 'a']

SOLUTION: 27373

PROBLEM: 6, 10, ['2095', '7189', 'j', 'i', '6105', 'f', 'I', 'z', '7903', '7165']

SOLUTION: 15068

PROBLEM: 7, 19, ['501', '6557', 'W', 'C', 'b', 'E', 't', 'N', 'k', 'r', '7069', '4643', 'i', 'M', '2713', 'r', 'w', '8967', 'd', '4941', '5095', 'w', '6435', '6695', 'M', 'p', 'U', 'Y', 'k']

SOLUTION:
23392