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.
18, 18, ['K', 'n', 'x', '7817', 'i', '5455', 'I', '427', 'O', '647', '9451', 'V', '7667', '2203', '4221', '1771', 'y', 'z', 'U', 'T', '2261']