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.
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Question: 1, 2, ['e', 'F']

Answer: Fe


Question: 5, 5, ['6131', '6209', 'H', 'g', '4529', '491', '2143', '6281']

Answer: 9254


Question: 15, 21, ['b', 'D', 'C', 'J', '467', '3011', 'y', 'o', 'C', '8235', '1149', '2101', 'w', '35', 'y', 'L', 'P', 's', '2791', '289', 'z', '6357']

Answer:
z9821972sPLy