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: 21, 29, ['8715', 'o', 'F', '1049', 'j', 'N', 'u', 't', 'o', '3513', '4271', 'i', 'C', '8809', '3203', 'v', 'p', '1387', 's', 'W', '9849', '5805', 'Q', '2519', 'w', 'Q', '9267', 'R', '5407', 'X']

5407R9267Qw2519Q58059849