TASK DEFINITION: In this task, you are given inputs 'i', 'j', and A, where 'i' and 'j' are integers and A is a list. A list is shown by two brackets and comma-separated numbers and characters inside, like ['1', '12', 'l']. You need to concatenate all elements of A from the ith element to the jth element, and then reverse the resulting string. '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'. Perform the operations in order, i.e., do not reverse first and then concatenate.
PROBLEM: 4, 16, ['S', '5719', '173', 'P', 'a', '5791', 'e', '6279', 'q', '2585', '9533', 'r', '849', 'h', '3259', '3707', '4939', 'X', 'e']

SOLUTION: 70739523h948r33595852q9726e1975aP

PROBLEM: 3, 6, ['6843', '7805', 'h', '9097', 'O', 'u']

SOLUTION: uO7909h

PROBLEM: 4, 10, ['7781', 'j', '2711', 'Y', 'L', 'N', 'o', '6821', 'n', 'M', '1413']

SOLUTION:
Mn1286oNLY