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.
4, 6, ['i', 'Q', '3987', 'E', '6489', '5489', 'U', '4411', '2013', '5387', '7373', '3229', '9709', 'X', '6955', '9635', '8369', '97', '6173']