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:
8, 8, ['n', '9001', 't', 'e', 'W', '2287', 'f', '2735', 'z', '3065', 'J', '5609', 'e', 's', 'F']

Ex Output:
5372


Ex Input:
1, 1, ['f', 'E', 'G', '9657']

Ex Output:
f


Ex Input:
8, 21, ['U', '8721', '3597', '3015', 'e', '2601', 'f', '1867', 'D', 'o', '2871', 'd', 'v', '4185', 'O', 'f', '5993', '4633', 'e', 'Z', 'f', '2561', '6101', 'n', 'Z', 'G']

Ex Output:

fZe33643995fO5814vd1782oD7681