You will be given a definition of a task first, then some input of the task.
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.

14, 18, ['1993', 'x', 'M', 'E', 'J', '2489', 'J', '1725', 'g', 'A', '5977', '795', 'l', 'L', 'y', '5485', '8371', 'z', '9501', '8549', 'w', '6605', 'B', 's']
Output:
z17385845yL