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 find all elements of A from the ith element to the jth element, reverse the order in which they occur, and then concatenate them to output the resultant 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 concatenate the elements and then reverse the string.
Input: 3, 17, ['9791', 'r', 'i', 'b', '7199', 'p', 's', 'x', 'I', 'c', 'v', 'P', '8693', 'R', 'S', 'N', 'n', '3877', '69']

nNSR8693PvcIxsp7199bi