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:
1, 2, ['U', 'G', 'N']

Ex Output:
GU


Ex Input:
1, 3, ['8975', '5175', 'X']

Ex Output:
X51758975


Ex Input:
3, 9, ['1317', '9485', 'l', '453', '9895', 'Q', 'g', 'Q', 'K', 'W', 'S', '6829', '5867', '6989', 'X']

Ex Output:

KQgQ9895453l