In this task, you are given inputs i, j, and A, where i and j are integers and A is a list. You need to find all elements of A from the ith element to the jth element, reverse the order in which they occur, and then concatenate them to output the resultant 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 concatenate the elements and then reverse the string.

[EX Q]: 4, 5, ['5611', '2101', '3829', 'H', 's', '6545', 'X', 'T', 'q', 'p', 'O', 'C', 'U']
[EX A]: sH

[EX Q]: 1, 3, ['u', 'D', '6391']
[EX A]: 6391Du

[EX Q]: 1, 11, ['743', '3901', 'R', '3957', '6325', '4491', 'y', 'U', 'B', '4945', '385']
[EX A]:
3854945BUy449163253957R3901743