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, 4, ['6969', 'P', '8161', '6347', 'P', 'S', 'z']
answer:
74361618P9696


question:
6, 10, ['a', '8847', 'W', '4483', 'D', 'm', '5431', 'y', '2113', 'N', 'F', '6803', '9735', 'T', 'D', 'O', 'v', 'V', 'l', '7835', 'M']
answer:

N3112y1345m