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: 15, 15, ['3521', 'o', 'O', '8905', 's', 'j', 'c', 'U', '5399', 'y', 'F', 'z', 'L', 'W', 'U', '4019', 'a', 'M', 'z', '3219', '6757', 'i']

U