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, 4, ['U', '4013', '3925', '9017', '3425', 'H', '9015', '4053', '8915', '5945', '8979', '2203']

Ex Output:
710952933104


Ex Input:
1, 1, ['W', '3467']

Ex Output:
W


Ex Input:
3, 13, ['4603', 'Z', 'K', '67', '2277', '3159', '8907', 'F', 'T', '1561', 't', 'p', '9107', 'O', '2573', 'a', 'N', 't', 'E', '4347', 'c', 'D', '3195']

Ex Output:

7019pt1651TF70989513772276K