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:
17, 21, ['5503', '2979', '6307', '633', 'n', '9339', '5829', '5291', '8967', 'i', '9063', '975', 'G', '9187', '3227', 'A', '3487', '8187', 'H', '6097', 'H']

Ex Output:
H7906H78187843


Ex Input:
2, 4, ['i', '2555', 'G', '4549', 'a', '7443', '5361']

Ex Output:
9454G5552


Ex Input:
5, 5, ['1237', '7517', '9703', 'V', 'E', '1323', '907', '5793', '1911', '4433']

Ex Output:

E