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:
1, 2, ['S', '7763']

Ex Output:
3677S


Ex Input:
2, 3, ['G', 'G', '7823', '8645', 'k', '1369', '7495', 'V', '2195', 'x', '3061', 'k', '7539', 'H', '8197', 'S', '7969', '9259', 'j']

Ex Output:
3287G


Ex Input:
15, 19, ['l', '2411', '6201', '3085', '8633', '6721', '1725', 'G', '8029', '4417', '6443', '5375', 'K', '5163', '6383', '6753', '5977', '3893', '1531', 'Z']

Ex Output:

13513983779535763836