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.

[Q]: 3, 15, ['O', 'a', '6377', 'R', '1363', '8013', '1923', '4039', 'j', '1365', 'E', 'P', '7225', '7813', 'I']
[A]: I31875227PE5631j9304329131083631R7736


[Q]: 4, 4, ['675', 'e', 'A', 'H', 'O', 'E', 'g', 'j', 'j', '5167', '2367', 'u', 'E', '753', 'M']
[A]: H


[Q]: 12, 14, ['857', 'g', '6715', '4585', '431', 'n', 'P', 'Y', '9527', 'j', '8317', '5045', 'r', '5045', 'r', 'R', 'm', '4063', 'E', 'q', 'A', 'g', '3147', '7855', '891', 'l']
[A]:
5405r5405