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, 15, ['3571', 'D', '1249', 'g', '2843', '8589', 'R', '1161', '5653', '1821', 'w', 'b', 'i', 'c', '8247', '1397']
answer:
7428cibw128135651611R98583482g9421D1753


question:
1, 1, ['g', '3127', 'O']
answer:
g


question:
13, 18, ['b', '1391', '5513', 'h', '9171', 'S', '8869', 'i', 'f', 'y', 'r', 'a', 'K', 'e', '391', 'Y', '5355', '2199', 'l', '4509']
answer:

99125535Y193eK