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:
2, 2, ['G', 'S']

Ex Output:
S


Ex Input:
3, 6, ['643', 'X', 'F', '7453', '8495', '7943']

Ex Output:
349759483547F


Ex Input:
6, 11, ['J', 'p', '5653', '1549', '8009', 'R', 'A', 'H', '7807', 't', 'c', '79', '8449', 'l']

Ex Output:

ct7087HAR