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: 18, 21, ['9581', 'Q', 'w', '8565', 'Y', '2921', '9831', '4909', '6577', '7197', 'w', '3981', 's', '8567', 'z', '6009', '1637', 'Z', '6141', '5837', '6517']

651758376141Z