Definition: 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.
Input: 5, 20, ['k', '9949', 'N', 'B', '3519', 'z', '8853', 'H', '2391', '5589', '9383', 'T', '5009', '9603', '6705', '4509', 'E', 'J', 'W', '5157', '7295', 'm', '6585', '3899', 's', 'c', '171', '4571', 'Q', 'F']

5157WJE4509670596035009T938355892391H8853z3519