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:
1, 3, ['8015', 'y', 'r', '8077', 'U']

Ex Output:
ry5108


Ex Input:
11, 18, ['W', '5215', 'G', '6229', 'z', 'R', 'e', 'U', '5847', 'L', '1587', '7287', 'a', 'S', '4887', 'B', 'F', 'h', '7409', '8297', 'h', 'N', 'E', '9925', 'B', 'l', '6091', '1345']

Ex Output:
hFB7884Sa78277851


Ex Input:
4, 12, ['91', '1157', '5149', 'G', '4889', '8313', 'U', '2765', 'K', '4489', 'D', 'n', '3175', '4699', '9673', 'r']

Ex Output:

nD9844K5672U31389884G