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 Input:
4, 22, ['5409', 'h', 'u', 'C', 'b', '7979', 'M', '6477', 'k', 'G', '1997', '9033', '2637', 'l', 'y', '8427', '5107', '6743', '5677', '2471', '2225', 'E', 'Q']

Ex Output:
E522217427765347670157248yl736233097991Gk7746M9797bC


Ex Input:
10, 10, ['7719', 'K', '7323', '7843', '7079', 'y', '6777', 'M', 'S', 'v', 's', '4857', 'J', '8269', 'm']

Ex Output:
v


Ex Input:
7, 7, ['H', 'V', 'C', '2699', 'i', 'Q', 'B', 'C', 'o', '5365', '2731', '6035', '1683', 'O', '2477', 'J', '3059', '2771', 't', 'P', 'C', '2167', '9445', '9821', 'U', 'F']

Ex Output:

B