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:
6, 8, ['J', '4955', '3497', '8869', 'n', '2093', '6249', 'A', '8957']
answer:
A94263902


question:
4, 20, ['3987', 'J', 'o', '439', 'C', 'F', 'P', '1491', 'R', 'Y', 'o', 'n', 'P', '2023', '9823', 'J', 'm', '7619', '4267', '2547', 'y', '1765', 'F', '9769', 'z']
answer:

745276249167mJ32893202PnoYR1941PFC934