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, 6, ['z', 'b', '2697', 'W', '1449', 'x', '5327']
answer:
x9441W7962


question:
16, 24, ['w', 'K', 'd', 'm', '7173', 'Q', 'D', 'h', 's', 'O', '9497', 'L', 'O', 'G', 'T', 'F', '2749', '6165', '8807', '3025', 'a', '953', '5531', 'P', '3635', '1789', 'u', '7785', '5287']
answer:
P1355359a5203708856169472F


question:
18, 20, ['R', 'e', '7709', '797', '8247', '4525', '2843', '9713', '9885', 'H', 'e', '3129', 'i', 'c', '3665', 'F', '1895', '7813', 's', 'R', 'N', 'M', '1195', 'L', '8879', '6333', 'Q', 'x', '1745']
answer:

Rs3187