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, 10, ['6935', '8323', '6167', 'I', 'G', 'f', '303', '3387', '3257', '3069', 'q', 'r', '187', 'k', '6031', '8221', '721']
answer:
960375237833303fGI


question:
3, 4, ['3097', 'E', '4255', '1665', '7179']
answer:
56615524


question:
4, 15, ['2025', 'B', '3745', 'f', 'A', 'g', '6403', 'j', 'K', '7509', '6693', '6643', 'T', '661', '949', 'M', 'E', 'c', 'Z', 'N', 's', '9165']
answer:

949166T346639669057Kj3046gAf