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:
2, 4, ['o', '5393', 'p', 'h', '5617', 'F', 'I', 'a']

Ex Output:
hp3935


Ex Input:
4, 7, ['1247', 's', 'J', 'w', 'X', '7211', 'c']

Ex Output:
c1127Xw


Ex Input:
1, 3, ['139', '7015', '2765', '1387']

Ex Output:

56725107931