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, 4, ['2419', '643', '8177', '7291', '561', '6529', '4101', 'u', '6445']

Ex Output:
19277718


Ex Input:
2, 13, ['o', 'B', '5117', 'h', '3007', '2037', 'j', '2651', 'b', 'b', '8977', 'v', 'U', 'l', '3949', 'e', 'x', '6539', '3663', '1359', '2851']

Ex Output:
Uv7798bb1562j73027003h7115B


Ex Input:
1, 7, ['7979', '3699', 'l', '2237', 'U', '6939', 'p', '6573', 'Y', '1083', 'l', 'y', '2939', '1391', '8439', '9947', '3395']

Ex Output:

p9396U7322l99639797