instruction:
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.
question:
3, 5, ['j', '239', '9689', 's', 'C', 'w']
answer:
Cs9869


question:
2, 13, ['o', 'B', '5117', 'h', '3007', '2037', 'j', '2651', 'b', 'b', '8977', 'v', 'U', 'l', '3949', 'e', 'x', '6539', '3663', '1359', '2851']
answer:
Uv7798bb1562j73027003h7115B


question:
13, 14, ['2699', 'u', '6237', 'a', 'S', '7577', 'f', '3571', '5681', '9877', 'W', '8319', 'n', '479', 'A', '883', 'l', 'g']
answer:

974n