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: 10, 23, ['U', '9975', 'r', 'I', 'x', '8203', '6261', '8759', '5189', '3961', 'r', 'S', 'r', '301', 'L', '9777', '2435', 'Q', 'D', 'U', '1767', '829', 'L', '3389', 'x']

L8291767UDQ24359777L301rSr3961