In this task, you are given inputs 'i', 'j', and A, where 'i' and 'j' are integers and A is a list. A list is shown by two brackets and comma-separated numbers and characters inside, like ['1', '12', 'l']. You need to concatenate all elements of A from the ith element to the jth element, and then reverse the resulting 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 reverse first and then concatenate.
6, 15, ['5457', 'y', '3459', '8681', '987', 'R', 'n', '1833', 'U', '1677', 'q', '3723', 'y', 'H', 'f', '4379', '1963', '1389', 'V', '2547', '4461']