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: 2, 5, ['m', 'o', 't', 'c', 'S', 'R', 'I', '4937', '1127', '1611', '285', '3653', '309', 'y', '513', 'i', '8005', 'n', '6915', '8585', 'G', 'A', '1921', 'd']

SOLUTION: 0

PROBLEM: 2, 3, ['u', '7053', '303', '329', 'D']

SOLUTION: 7356

PROBLEM: 18, 20, ['U', '7165', 'M', 'O', 'C', '5801', 'a', 'X', '5651', '4939', '3535', '4385', '8175', 'a', '1919', '709', '9639', 'W', 'w', 'b']

SOLUTION:
0