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: 2, 15, ['3997', 's', 't', 'U', '2027', 'Y', 's', '4561', '2905', 'Z', '2735', '7467', 'I', 'y', '389', 'x']

389yI74672735Z29054561sY2027Uts