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: 8, 15, ['B', 't', 'M', '1857', '4497', 'I', '6207', '5345', 'z', '6829', '3641', '2273', '7701', '7863', '1855', '4915', 'r', 'N']

185578637701227336416829z5345