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.

7, 9, ['s', '3175', '1431', 'a', 'u', '7265', 'N', 'H', '1217', 'x', 'u', 'a', 'c', 'n', 'b', 'J', 'B', '6907', 'D', '6691', 'N', '7959', 'm']
7121HN

19, 28, ['2809', '2943', '209', 'I', '4961', 'z', '6499', 'j', '8323', 'v', '6955', 'E', '2591', '5523', 'D', 'j', '3929', 'L', '501', 'Y', 'e', 'p', 'F', '1073', 'o', '3531', '9245', 'K']
K54291353o3701FpeY105

7, 10, ['E', '2355', '155', '8249', '507', 'A', '3723', 'n', 'Y', 'j', '7773']

jYn3273