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:
18, 18, ['O', '7845', 'f', '2313', 'f', '9661', 's', 'O', '6009', '6997', 'f', 'T', 'f', '6517', 'E', 'H', 'k', 'Y', 'i', '2839', '1839', '3251', 'H', '1939']
answer:
Y


question:
1, 9, ['C', 'V', '9945', 'W', 'R', 't', '471', 'Y', 'F', '2445', 'd', 'R', 'l', 'f', '5041', 'm', '7347', 'j', '6257']
answer:
FY174tRW5499VC


question:
9, 10, ['3335', 'R', 'o', '9821', '9111', 'x', 'd', 'i', 'I', 'j', 'N', 'r', '3485', '809', 'T', '2067', '7589']
answer:

jI