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.
18, 20, ['2883', 'W', '6659', '1419', 'J', 'A', '8547', 'G', 'd', 'V', 'k', '4755', '4949', 'S', 't', 'G', '5717', 'W', '1851', '6207', '4067', 'w', 'S', '5911', '247', '1989']