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: 20, 27, ['3069', '5387', '4853', '6233', '7063', '6919', '2361', 's', 'Q', 'l', '7827', '1671', '6115', 'V', 'w', 'r', '5491', 's', '2715', '285', 'H', 'a', 'r', '3753', '9811', 'U', '8473', 'd', '781', 'u']

8473U98113753raH285