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, 13, ['6993', '5601', 'n', 'J', 'E', 'M', 'd', 'T', 'V', 'C', '4969', 'J', 'F']

Ex Output:
FJ9694CVTdMEJ


Ex Input:
3, 5, ['j', '239', '9689', 's', 'C', 'w']

Ex Output:
Cs9869


Ex Input:
2, 4, ['9205', '2013', 'W', '6141', '6037', '5359', '8831', 'c']

Ex Output:

1416W3102