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: 13, 18, ['n', '5213', 'x', '4031', 'e', '6871', 'n', '2275', 'Y', '3107', 't', '2215', '8817', 'v', '2387', 'u', 'r', '1989', 'x', '3279', 'N', '4239', '3897', 'J', 'H', '8813', '5643', '5789', '3823', 'G']

1989ru2387v8817