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 Input:
1, 3, ['b', 'd', '227', '3903', '1863', 'O', 'k', 'i']

Ex Output:
227db


Ex Input:
5, 18, ['4905', 'j', 'd', 'S', '8381', '233', 'r', 'i', 'P', '4971', 'Q', '1991', 'L', 'a', '9383', '931', 'T', 'g', '2561', 'L', '2757', 'e', '1829']

Ex Output:
gT9319383aL1991Q4971Pir2338381


Ex Input:
7, 7, ['l', 'm', 'W', '6545', '2455', '519', '7633']

Ex Output:

7633