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:
15, 18, ['9099', '2041', '7065', '1323', '2267', '5877', 'r', 'j', '4411', 'u', 'V', '4919', '6401', '8449', 'X', 'H', 'z', 's', '2543', '4643']

Ex Output:
szHX


Ex Input:
3, 5, ['m', 'U', '3235', 'B', '2015']

Ex Output:
2015B3235


Ex Input:
7, 7, ['2099', '6879', 'a', '2737', 'F', '3789', 'F', 'I', 'w', '8407', 'o', '6267', 'n', 'w', 'm', '6727']

Ex Output:

F