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, 3, ['D', 'a', '1119', 'R', 'b', 'N', 'a', 'n', '4229']
answer:
9111aD


question:
7, 8, ['8275', 'o', 'f', '6403', '7399', 'M', 'E', '7879', 'e', 'L', 'F', '2019']
answer:
9787E


question:
10, 11, ['6247', 'O', '9679', 'b', 'L', '7037', '3835', '8299', 'E', 'n', 'D', 'O']
answer:

Dn