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: 6, 27, ['o', '7163', 'U', '4777', 'B', '7997', '1637', 'J', '6839', 'q', 'k', 's', '3871', '2325', 'E', 'W', 'K', 'U', 'u', 'f', '5863', 'v', '2719', '1027', 'W', 'X', 'L']

LXW10272719v5863fuUKWE23253871skq6839J16377997