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:
2, 3, ['N', 'U', 'D', 'm', '9001', 'I', '2675', 'l', '2771', 'U', '1181', 'U']

Ex Output:
DU


Ex Input:
7, 10, ['4843', 'p', 'I', '8757', '2967', '7461', 'c', '2639', 'p', '8895']

Ex Output:
5988p9362c


Ex Input:
1, 6, ['U', 'i', '5369', '907', 'n', 'C', 'a', '3735', '7359', 'q', 'l', '4011', 'N', 'w', 'M', '5249']

Ex Output:

Cn7099635iU