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: 14, 19, ['253', 'L', '3721', 'p', '2985', '1751', '7253', 'y', '7893', '5235', '4843', '9869', 'Z', '8697', 's', '3585', 'e', '2715', '6819']

68192715e3585s8697