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, 8, ['b', 'y', '8779', '3949', 'c', 'a', '111', '6649']

Ex Output:
9466111ac94939778


Ex Input:
3, 4, ['19', '2669', 'v', 'd', '2221', '4219', 'A', 'P', '7499', 'z', 'm', 'l', '427', 'u']

Ex Output:
dv


Ex Input:
14, 21, ['M', '5093', 'X', 'L', '7343', '1075', '8591', 'q', '3153', 'u', '9631', '303', 'J', '337', '857', 'f', '9503', 'l', '3577', '6999', 'f', 'E', '8043', 'l', 'Y', '6023', '9847']

Ex Output:

f99967753l3059f758733