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:
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:
1, 2, ['S', '411', '3257', 'c', '3483', 'i', 'h', 't']
answer:
114S


question:
7, 9, ['b', '769', 'z', 't', '7375', 'c', 'D', 'k', '4081', 'N', '5539', 'F', '5503', '4167', '3237', '6391', 'Z', '8245', '5255', '6369', 'R', 'I', 'C', 'U']
answer:

1804kD