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, ['6911', 'W', '6285', '6669', 'c', 'R', '9455', 'B', '585', '8007', '9597', '4007', '8317', '6113', 'I', 'h', '8983', '9553', 'z', '1885', 'F', 'l', '9883', 'L', 'U']

F1885z