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, ['8097', '3167', '809']
answer:
908


question:
18, 20, ['5263', '7963', '8931', 'I', 'n', '8167', 'A', '5429', 'O', '6539', '7303', 'V', 'l', 'd', 's', '8377', 'Z', '7345', 'X', 'D', '6125', 'c', 'o', 'x', 'I', '2807', '3995', '3297', 'O']
answer:
DX5437


question:
3, 21, ['f', 't', '3149', '5335', 'I', '5025', '3551', '5139', 'J', '6381', '7883', '8353', '5481', 'u', '9671', '4891', '8859', 'p', '3765', 'Y', '4625', '3315', 'k', 'a', 'T', '2733', '8667', '3555', '3785']
answer:

5264Y5673p958819841769u1845353838871836J931515535205I53359413