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:
1, 1, ['f', 'E', 'G', '9657']
answer:
f


question:
8, 12, ['K', 'x', 'a', 'A', '6203', '117', '1007', '6063', '569', '9809', '9097', 'w', '3939', 'l', 'V']
answer:
w790990899653606


question:
9, 18, ['1851', '2899', 'p', 'V', 'F', 'd', '2221', 'Z', 'V', 'Z', 'q', '435', 'R', 'a', 'y', '8427', 'H', '5677', 'z', '1605', '1051', 'M', 'd', 'k']
answer:

7765H7248yaR534qZV