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: 15, 21, ['t', 'e', 'U', '5431', '5069', '1987', 'u', 'l', 'd', 't', 'o', '8797', '8283', '8669', '5405', '2539', '3371', 'B', 'b', 'L', 'I', '8271', 'O', 'A', '5183', 'K', 'v', 'w', '3033', '6379']

ILbB337125395405