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:
11, 15, ['Y', 'L', 'I', 'u', 'z', '4077', 'K', '4679', 'l', '9269', '4071', '1789', 'b', '2139', 'b', '111', '6715', 'H', '3981']

Ex Output:
b2139b17894071


Ex Input:
6, 7, ['R', '4581', 'r', '8391', 'D', '4973', '8835', 'Q', 'Y', '2441']

Ex Output:
88354973


Ex Input:
19, 20, ['3457', 'R', 'O', '1711', 'E', '5843', '9027', '2515', '2887', '2165', 'C', 'p', '1933', '5139', '6285', '2207', '9159', '4087', 'L', '3439', 'd', '1603', 'Z']

Ex Output:

3439L