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:
12, 12, ['c', 'a', 'G', 't', '753', 'x', 'I', '4479', 'i', 'y', 'J', 'w']

Ex Output:
w


Ex Input:
4, 5, ['8055', '701', 'J', '7719', 'w', '1403', 'p', '7939', 'N', '7599', 'B', '5797', 'v', 'x', 'B', '5093', '2315', 'f', 's', '6103', '1891', '329', 'p', 'U', '4761', '815', '735']

Ex Output:
w9177


Ex Input:
17, 21, ['C', '9891', 'y', 'j', '8075', 'z', '2875', 'Z', '6211', 't', '4297', '8051', '9339', '9997', 'h', '1169', 'c', '1373', 'r', '9239', 'H', 'N', 'u', '8739', 'h', '6877']

Ex Output:

H9329r3731c