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.
7, 19, ['E', 'x', 'Y', '1427', 'S', '2971', 'O', '9273', '6261', 'y', 'g', 'k', 'e', '5649', '8119', 'w', '6779', '5315', '1203', '7737', 'g', '8271', 'K', '3629', 'i', 'g', 'f', '4399', '1525', '6271']