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: 12, 20, ['9159', '8119', '2103', '8735', 'O', 'P', 'y', 'E', 'k', '8513', '6083', '7899', '8861', 'j', 'Y', '3139', '9731', '2329', '2461', 'l', '2207', '689', '8129']

l2461232997313139Yj88617899