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: 17, 20, ['6555', 'J', '487', '6189', 'e', 'D', 'x', '455', '3613', '1193', '6557', '8693', '1837', '8369', 'J', 'X', 'O', '6669', 'V', 'Q', 'Z', 'n', 'c', 'a', 'Q']

QV6669O