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:
5, 18, ['u', '3123', 'g', 'r', 'M', '559', 'F', 'F', '3229', '3207', 'w', 'X', 'U', 'j', 'f', 'p', '7623', '6121', '2279', 'v']

Ex Output:
61217623pfjUXw32073229FF559M


Ex Input:
12, 14, ['8471', '6883', '8267', 'D', '385', 'Q', '6725', '1239', '2767', '7219', '4423', '5391', '8513', '5963']

Ex Output:
596385135391


Ex Input:
14, 19, ['6095', 'z', 'Y', 'X', 'v', 'v', 'I', '7799', '8979', 'j', '5535', 'Z', 'I', 'B', '9987', '1225', '5203', 'w', 'n', '3793']

Ex Output:

nw520312259987B