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: 2, 18, ['P', 'A', 'O', '8485', 'r', 'W', '1381', '7865', '9491', '9833', '1987', 'x', 'C', 'F', 'r', 'L', '9749', 'o', 'b', 'S', 'H', 'l', '7821']

o9749LrFCx19879833949178651381Wr8485OA