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:
5, 7, ['2725', '1489', 'P', '2021', 'c', '1605', 'R', 'T', 'p', 'q', '6487', '3395', 'u', 'x']

Ex Output:
R5061c


Ex Input:
5, 5, ['6131', '6209', 'H', 'g', '4529', '491', '2143', '6281']

Ex Output:
9254


Ex Input:
3, 6, ['3053', 'D', 'K', 'n', 's', 'N', '2523', 'd', '1827', '2031', '2743']

Ex Output:

NsnK