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, 5, ['f', 'd', '2691', 't', 'u']

Ex Output:
ut1962d


Ex Input:
2, 3, ['X', '8243', '1209']

Ex Output:
90213428


Ex Input:
5, 12, ['3889', 'n', 'b', '4787', '73', '6309', 'Y', 'B', '2405', 'W', 'A', 'v', 'V', '1187', '3059', '4843', 'q', 'Q', '4171', 'W']

Ex Output:

vAW5042BY903637


