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: 9, 12, ['8329', '2479', '5903', '7277', 'm', 'E', 'j', '6243', '6729', 'O', '271', 'M', '5955', 'P', '9', 'D', '2701', '7197', '3137', 'y', '7811', 'L']

M271O6729