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: 1, 12, ['Y', '8117', '8509', 'O', '1505', '927', '2505', '3117', '6127', 'u', '6721', '4307', 'm']

43076721u6127311725059271505O85098117Y