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: 19, 21, ['8387', 'u', '9583', '7741', 'U', 's', 'P', 'F', '1661', '9951', 'y', '5493', '2485', '9581', '6643', 's', 'i', 'V', 'Z', '2727', '8341', 'x', 'n', '2135']

83412727Z