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, 17, ['781', '1949', '8017', 'I', 'F', 'k', 's', 'f', '9531', '3769', '8135', 'R', '7643', 'v', '6217', '4085', 'M', '1993']
answer:
M58047126v3467R531896731359fskFI71089491


question:
2, 3, ['X', '8243', '1209']
answer:
90213428


question:
16, 30, ['Y', 'E', '4267', '2453', 'v', 'F', 't', 's', '5523', 'u', 'm', 'w', 'V', 'Q', '9963', 'Y', 'v', 'I', '5993', '5317', 'x', 'W', '4493', 'U', 'q', 'T', '2121', '7781', '5345', 'G']
answer:

G543518771212TqU3944Wx71353995IvY