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:
7, 18, ['4879', '857', 'X', '8629', 'K', 'l', 'U', '5611', '5989', '4439', '4897', 'D', 'p', '8109', 'F', 'a', '4665', 'Q']

Ex Output:
Q5664aF9018pD7984934498951165U


Ex Input:
10, 11, ['i', 'w', 'V', '2695', 'I', 'q', 'o', 'X', 'u', 's', 'e', 'f', '7693', 'q', '5845', 'e', '4161', '3059', 'F', '6863', '985', 'D', '3643', '383', 'A', '7515', '4335']

Ex Output:
es


Ex Input:
1, 5, ['6753', '175', '5383', 'A', 'a']

Ex Output:

aA38355713576