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, 20, ['3815', 'K', '2357', '2323', 'v', '3189', '4049', '5917', 'y', 'k', '7987', 'm', 'm', 'N', 'l', 'W', 'z', 'e', 'S', '7357', '5515', '8277', '6519', 'x', 'V', '8703']

7357SezWl