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: 10, 21, ['9287', 'X', 'N', 'O', '8135', 'x', '8713', '5273', 'W', '2471', 'H', '1657', 'o', '5911', 'w', 's', 'R', 'U', 'f', 'i', 'J', '8869', '2985', '1337']

JifURsw5911o1657H2471