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, ['W', 'I', 'f', 'R', '7797', 'R']

Ex Output:
IW


Ex Input:
3, 9, ['I', 'L', 'k', '543', 'R', 'D', 'B', '9659', '7595', 'O', '8599', 'p', 'x', '7577', '2979', '8467', 'w', 'Q', '8385', '133', '675', '7447', 'l', 'J', '7157']

Ex Output:
75959659BDR543k


Ex Input:
17, 21, ['G', '6731', '5011', '5327', 'K', '1601', '7927', 'H', 'Q', '2519', '7897', 'G', 'x', '4253', 'g', 'o', 'D', 'A', '6515', 'o', '9255', 'V', '6725', 'l', '5771', '783']

Ex Output:

9255o6515AD