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: 2, 7, ['e', 's', '7009', 'z', 'I', '8649', '6405', '551', 'C', '5325', 'V', 'i', 'w', 'K', 'w', 'R']

Answer: 50469468Iz9007s


Question: 2, 4, ['U', '4013', '3925', '9017', '3425', 'H', '9015', '4053', '8915', '5945', '8979', '2203']

Answer: 710952933104


Question: 12, 17, ['3935', 'E', 'Z', 'j', 'b', '1461', 'b', '5349', '9379', 'k', 'c', '207', 'E', 'X', '3491', 'X', '9797', '1635', '283', 's', 'b', '3019', 'I', '1631', '5343', 'Z', '8767', '3455']

Answer:
7979X1943XE702