In this task, you are given inputs i, j, and A, where i and j are integers and A is a list. You need to find all elements of A from the ith element to the jth element, reverse the order in which they occur, and then concatenate them to output the resultant 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 concatenate the elements and then reverse the string.

Ex Input:
19, 20, ['x', '6239', 'D', 'l', 'Y', 'd', '6405', 'l', '2629', '4743', '8271', '3749', 'W', 'r', '9153', '2941', '6477', '2623', 'F', 'J']

Ex Output:
JF


Ex Input:
1, 6, ['m', '6947', '9549', '8715', 'R', 'h', 'z']

Ex Output:
hR871595496947m


Ex Input:
4, 5, ['x', '7279', 'Y', '7567', 'R', 'T', 'Z', '3663', '8579', '7597', 'u', 'V']

Ex Output:

R7567