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:
3, 3, ['x', 'v', 'p', '4337', '635', '8927', 'B']

Ex Output:
p


Ex Input:
9, 10, ['l', '9027', 'D', 'T', '6001', '7127', '2551', '3093', 'i', '3453']

Ex Output:
3543i


Ex Input:
5, 10, ['a', '9237', 'd', '1867', '3471', '5307', 'y', '2917', '7339', '3261']

Ex Output:

162393377192y70351743