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: 15, 18, ['9639', 'R', '5343', 'O', 'c', 'm', '5963', 'L', '7773', '129', 'W', '1577', '9329', 'J', '3565', 'r', '6539', 'y', '6033', '3733', '9101', 'B', '9333', '1847', 'q', 'd', 'Z', '8223']

y6539r3565