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, 23, ['C', '1379', 'r', 'p', '1657', 'k', 'o', '2557', 'z', '5721', 'a', 'v', 'p', '4917', 'A', 'j', 'u', '1557', 'O', '9629', '87', '7949', '6001', '2515', '4451', '9515', 'x', 'S', '6627']