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, 3, ['2047', 'R', '6885', '1243', 'Z']
answer:
5886


question:
7, 12, ['4563', '7657', '4657', '1145', 'A', 'e', 'a', '5429', '3323', 'I', '569', 'R', '5013', 'U', 'v', 'l', 'h', 'z', 'e', 'D', 'n', 'h', 'h', '4673', '973']
answer:
R965I32339245a


question:
4, 9, ['B', 'c', 'V', 'U', 'W', 'v', '1275', 'a', 'v', '8917', 'u', '6641', '6977', '1617', '7665', 'g', 'n', '275', 'P', 'c', '3191', 'o']
answer:

va5721vWU