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: 4, 12, ['8239', '187', 'a', '4549', 'r', '3013', 'r', 'b', 'S', '65', 'A', '3079', '2553', 'H', 'z', 'T', 'a', '2253', 'G', 'f', '1823']

3079A65Sbr3013r4549