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.

[EX Q]: 5, 5, ['7991', '8029', '9605', 'u', '9539', 'q', '3789', 'i', '8639', '7477']
[EX A]: 9359

[EX Q]: 1, 2, ['4857', '9647']
[EX A]: 74697584

[EX Q]: 13, 14, ['5317', 'k', 'O', 'r', '3111', '3723', 'K', '463', '5063', '1101', '4241', '7747', 'l', '9353']
[EX A]:
3539l