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: 6, 16, ['5961', '4327', '4921', '7647', 'H', 'X', 'D', 'W', '2439', 'W', 'v', '4579', 'j', 'q', 'L', 'K', '1131', 'Y', 'E', '8829']

KLqj4579vW2439WDX