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: 8, 21, ['5987', '9263', 'l', 'd', '8225', '1561', 'S', 'o', '6579', 'f', 'K', 'a', 'L', 'l', '2085', '517', '677', 'U', '347', '591', '2141', '4043', '6995', '8585', 'Z', '7397']

2141591347U6775172085lLaKf6579o