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: 18, 25, ['3857', '299', 'O', '3627', '3495', 'D', '87', 'M', 'J', 'P', '1853', '431', '3713', '2087', '2485', 'O', 's', 'J', '8723', '6627', '6163', '9019', 'Z', '1329', '6247', 'G', 'f', 'm', 'J', 'u']

62471329Z9019616366278723J