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:
4, 4, ['339', '1345', '9749', '6877', 'b', 'K', 'f', '1443']
answer:
7786


question:
18, 20, ['1111', '8387', 'Q', 'O', 'A', 'E', '7233', 'o', '5603', 'H', '5793', 'k', '5603', 'B', 'F', 'e', 'Q', 'w', '9253', '6559']
answer:
95563529w


question:
9, 14, ['N', '5941', '8393', 'P', 'T', '6049', '7143', 'M', 'T', 'O', '9607', '741', 'v', 'F', 't']
answer:

Fv1477069OT