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: 10, 13, ['D', 'A', '4221', '7301', '1937', 'r', '5105', 'q', 'F', 'j', '9441', '6391', '7081', 'l', '6569', 'i', '8871', '5985']

Answer: 180719361449j


Question: 4, 10, ['6935', '8323', '6167', 'I', 'G', 'f', '303', '3387', '3257', '3069', 'q', 'r', '187', 'k', '6031', '8221', '721']

Answer: 960375237833303fGI


Question: 16, 21, ['q', 'S', 'i', '8077', '5111', '3405', '9107', 'm', '8827', '2419', 'z', 'B', 'f', '7467', '1277', 's', 'E', 'd', 'x', 'x', '5777', 'M', '6959', '663', 'z']

Answer:
7775xxdEs